diff --git a/app/Http/Controllers/Api/V1/Controller.php b/app/Http/Controllers/Api/V1/Controller.php
index 1cf01348..da63d507 100644
--- a/app/Http/Controllers/Api/V1/Controller.php
+++ b/app/Http/Controllers/Api/V1/Controller.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Http\Controllers\Api\V1;
 
 use App\Models\Organization;
+use App\Service\BillingContract;
 use App\Service\PermissionStore;
 use Illuminate\Auth\Access\AuthorizationException;
 
@@ -43,4 +44,9 @@ class Controller extends \App\Http\Controllers\Controller
     {
         return $this->permissionStore->has($organization, $permission);
     }
+
+    protected function canAccessPremiumFeatures(Organization $organization): bool
+    {
+        return app(BillingContract::class)->hasSubscription($organization) || app(BillingContract::class)->hasTrial($organization);
+    }
 }
diff --git a/app/Http/Controllers/Api/V1/ProjectController.php b/app/Http/Controllers/Api/V1/ProjectController.php
index 84d4b130..9f5748f9 100644
--- a/app/Http/Controllers/Api/V1/ProjectController.php
+++ b/app/Http/Controllers/Api/V1/ProjectController.php
@@ -95,6 +95,9 @@ class ProjectController extends Controller
         $project->is_billable = (bool) $request->input('is_billable');
         $project->billable_rate = $request->getBillableRate();
         $project->client_id = $request->input('client_id');
+        if ($this->canAccessPremiumFeatures($organization) && $request->has('estimated_time')) {
+            $project->estimated_time = $request->getEstimatedTime();
+        }
         $project->organization()->associate($organization);
         $project->save();
 
@@ -117,6 +120,9 @@ class ProjectController extends Controller
         if ($request->has('is_archived')) {
             $project->archived_at = $request->getIsArchived() ? Carbon::now() : null;
         }
+        if ($this->canAccessPremiumFeatures($organization) && $request->has('estimated_time')) {
+            $project->estimated_time = $request->getEstimatedTime();
+        }
         $oldBillableRate = $project->billable_rate;
         $project->billable_rate = $request->getBillableRate();
         $project->client_id = $request->input('client_id');
@@ -147,8 +153,8 @@ class ProjectController extends Controller
             throw new EntityStillInUseApiException('project', 'time_entry');
         }
 
-        DB::transaction(function () use (&$project) {
-            $project->members->each(function (ProjectMember $member) {
+        DB::transaction(function () use (&$project): void {
+            $project->members->each(function (ProjectMember $member): void {
                 $member->delete();
             });
 
diff --git a/app/Http/Controllers/Api/V1/TaskController.php b/app/Http/Controllers/Api/V1/TaskController.php
index 46778560..8c90f215 100644
--- a/app/Http/Controllers/Api/V1/TaskController.php
+++ b/app/Http/Controllers/Api/V1/TaskController.php
@@ -79,6 +79,9 @@ class TaskController extends Controller
         $task = new Task;
         $task->name = $request->input('name');
         $task->project_id = $request->input('project_id');
+        if ($this->canAccessPremiumFeatures($organization) && $request->has('estimated_time')) {
+            $task->estimated_time = $request->getEstimatedTime();
+        }
         $task->organization()->associate($organization);
         $task->save();
 
@@ -96,6 +99,9 @@ class TaskController extends Controller
     {
         $this->checkPermission($organization, 'tasks:update', $task);
         $task->name = $request->input('name');
+        if ($this->canAccessPremiumFeatures($organization) && $request->has('estimated_time')) {
+            $task->estimated_time = $request->getEstimatedTime();
+        }
         if ($request->has('is_done')) {
             $task->done_at = $request->getIsDone() ? Carbon::now() : null;
         }
diff --git a/app/Http/Requests/V1/Project/ProjectStoreRequest.php b/app/Http/Requests/V1/Project/ProjectStoreRequest.php
index 8e655749..167bd5cf 100644
--- a/app/Http/Requests/V1/Project/ProjectStoreRequest.php
+++ b/app/Http/Requests/V1/Project/ProjectStoreRequest.php
@@ -52,6 +52,7 @@ class ProjectStoreRequest extends FormRequest
                 'integer',
                 'min:0',
             ],
+            // ID of the client
             'client_id' => [
                 'nullable',
                 new ExistsEloquent(Client::class, null, function (Builder $builder): Builder {
@@ -59,6 +60,12 @@ class ProjectStoreRequest extends FormRequest
                     return $builder->whereBelongsTo($this->organization, 'organization');
                 }),
             ],
+            // Estimated time in seconds
+            'estimated_time' => [
+                'nullable',
+                'integer',
+                'min:0',
+            ],
         ];
     }
 
@@ -68,4 +75,11 @@ class ProjectStoreRequest extends FormRequest
 
         return $input !== null && $input !== 0 ? (int) $this->input('billable_rate') : null;
     }
+
+    public function getEstimatedTime(): ?int
+    {
+        $input = $this->input('estimated_time');
+
+        return $input !== null && $input !== 0 ? (int) $this->input('estimated_time') : null;
+    }
 }
diff --git a/app/Http/Requests/V1/Project/ProjectUpdateRequest.php b/app/Http/Requests/V1/Project/ProjectUpdateRequest.php
index 8bb5360e..51fc829d 100644
--- a/app/Http/Requests/V1/Project/ProjectUpdateRequest.php
+++ b/app/Http/Requests/V1/Project/ProjectUpdateRequest.php
@@ -62,6 +62,12 @@ class ProjectUpdateRequest extends FormRequest
                 'integer',
                 'min:0',
             ],
+            // Estimated time in seconds
+            'estimated_time' => [
+                'nullable',
+                'integer',
+                'min:0',
+            ],
         ];
     }
 
@@ -78,4 +84,11 @@ class ProjectUpdateRequest extends FormRequest
 
         return $input !== null && $input !== 0 ? (int) $this->input('billable_rate') : null;
     }
+
+    public function getEstimatedTime(): ?int
+    {
+        $input = $this->input('estimated_time');
+
+        return $input !== null && $input !== 0 ? (int) $this->input('estimated_time') : null;
+    }
 }
diff --git a/app/Http/Requests/V1/Task/TaskStoreRequest.php b/app/Http/Requests/V1/Task/TaskStoreRequest.php
index e35c496c..7c60ba1a 100644
--- a/app/Http/Requests/V1/Task/TaskStoreRequest.php
+++ b/app/Http/Requests/V1/Task/TaskStoreRequest.php
@@ -43,6 +43,19 @@ class TaskStoreRequest extends FormRequest
                     return $builder->whereBelongsTo($this->organization, 'organization');
                 }),
             ],
+            // Estimated time in seconds
+            'estimated_time' => [
+                'nullable',
+                'integer',
+                'min:0',
+            ],
         ];
     }
+
+    public function getEstimatedTime(): ?int
+    {
+        $input = $this->input('estimated_time');
+
+        return $input !== null && $input !== 0 ? (int) $this->input('estimated_time') : null;
+    }
 }
diff --git a/app/Http/Requests/V1/Task/TaskUpdateRequest.php b/app/Http/Requests/V1/Task/TaskUpdateRequest.php
index 81bca001..b9211eb7 100644
--- a/app/Http/Requests/V1/Task/TaskUpdateRequest.php
+++ b/app/Http/Requests/V1/Task/TaskUpdateRequest.php
@@ -38,6 +38,12 @@ class TaskUpdateRequest extends FormRequest
             'is_done' => [
                 'boolean',
             ],
+            // Estimated time in seconds
+            'estimated_time' => [
+                'nullable',
+                'integer',
+                'min:0',
+            ],
         ];
     }
 
@@ -47,4 +53,11 @@ class TaskUpdateRequest extends FormRequest
 
         return $this->boolean('is_done');
     }
+
+    public function getEstimatedTime(): ?int
+    {
+        $input = $this->input('estimated_time');
+
+        return $input !== null && $input !== 0 ? (int) $this->input('estimated_time') : null;
+    }
 }
diff --git a/app/Http/Resources/V1/Project/ProjectResource.php b/app/Http/Resources/V1/Project/ProjectResource.php
index 7f9069ca..2d8567cd 100644
--- a/app/Http/Resources/V1/Project/ProjectResource.php
+++ b/app/Http/Resources/V1/Project/ProjectResource.php
@@ -35,6 +35,8 @@ class ProjectResource extends BaseResource
             'billable_rate' => $this->resource->billable_rate,
             /** @var bool $is_billable Project time entries billable default */
             'is_billable' => $this->resource->is_billable,
+            /** @var int|null $estimated_time Estimated time in seconds */
+            'estimated_time' => $this->resource->estimated_time,
         ];
     }
 }
diff --git a/app/Http/Resources/V1/Task/TaskResource.php b/app/Http/Resources/V1/Task/TaskResource.php
index c360a7e1..26107935 100644
--- a/app/Http/Resources/V1/Task/TaskResource.php
+++ b/app/Http/Resources/V1/Task/TaskResource.php
@@ -30,6 +30,8 @@ class TaskResource extends BaseResource
             'is_done' => $this->resource->is_done,
             /** @var string $project_id ID of the project */
             'project_id' => $this->resource->project_id,
+            /** @var int|null $estimated_time Estimated time in seconds */
+            'estimated_time' => $this->resource->estimated_time,
             /** @var string $created_at When the tag was created */
             'created_at' => $this->formatDateTime($this->resource->created_at),
             /** @var string $updated_at When the tag was last updated */
diff --git a/app/Models/Project.php b/app/Models/Project.php
index 32317d1c..4eb555c7 100644
--- a/app/Models/Project.php
+++ b/app/Models/Project.php
@@ -27,6 +27,7 @@ use OwenIt\Auditing\Contracts\Auditable as AuditableContract;
  * @property bool $is_public
  * @property bool $is_billable
  * @property-read bool $is_archived
+ * @property int|null $estimated_time
  * @property Carbon|null $archived_at
  * @property Carbon|null $created_at
  * @property Carbon|null $updated_at
@@ -56,6 +57,7 @@ class Project extends Model implements AuditableContract
         'name' => 'string',
         'color' => 'string',
         'archived_at' => 'datetime',
+        'estimated_time' => 'integer',
     ];
 
     /**
diff --git a/app/Models/Task.php b/app/Models/Task.php
index 037a33cb..fa696505 100644
--- a/app/Models/Task.php
+++ b/app/Models/Task.php
@@ -23,6 +23,7 @@ use OwenIt\Auditing\Contracts\Auditable as AuditableContract;
  * @property string $project_id
  * @property string $organization_id
  * @property Carbon|null $done_at
+ * @property int|null $estimated_time
  * @property Carbon|null $created_at
  * @property Carbon|null $updated_at
  * @property-read Project $project
@@ -48,6 +49,7 @@ class Task extends Model implements AuditableContract
      */
     protected $casts = [
         'name' => 'string',
+        'estimated_time' => 'integer',
         'done_at' => 'datetime',
     ];
 
diff --git a/database/factories/ProjectFactory.php b/database/factories/ProjectFactory.php
index ff4eb278..cfb33075 100644
--- a/database/factories/ProjectFactory.php
+++ b/database/factories/ProjectFactory.php
@@ -33,9 +33,19 @@ class ProjectFactory extends Factory
             'archived_at' => null,
             'client_id' => null,
             'organization_id' => Organization::factory(),
+            'estimated_time' => null,
         ];
     }
 
+    public function withEstimatedTime(): self
+    {
+        return $this->state(function (array $attributes): array {
+            return [
+                'estimated_time' => $this->faker->randomNumber(3),
+            ];
+        });
+    }
+
     public function billable(): self
     {
         return $this->state(function (array $attributes): array {
diff --git a/database/factories/TaskFactory.php b/database/factories/TaskFactory.php
index b21e2f3c..beeaaf56 100644
--- a/database/factories/TaskFactory.php
+++ b/database/factories/TaskFactory.php
@@ -26,6 +26,7 @@ class TaskFactory extends Factory
             'project_id' => Project::factory(),
             'organization_id' => Organization::factory(),
             'done_at' => null,
+            'estimated_time' => null,
         ];
     }
 
diff --git a/database/migrations/2024_07_02_134307_add_estimated_time_to_projects_and_tasks_table.php b/database/migrations/2024_07_02_134307_add_estimated_time_to_projects_and_tasks_table.php
new file mode 100644
index 00000000..2ca1feb0
--- /dev/null
+++ b/database/migrations/2024_07_02_134307_add_estimated_time_to_projects_and_tasks_table.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->integer('estimated_time')->unsigned()->nullable();
+        });
+        Schema::table('tasks', function (Blueprint $table): void {
+            $table->integer('estimated_time')->unsigned()->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->dropColumn('estimated_time');
+        });
+        Schema::table('tasks', function (Blueprint $table): void {
+            $table->dropColumn('estimated_time');
+        });
+    }
+};
diff --git a/tests/TestCase.php b/tests/TestCase.php
index c246269d..6fdb3a85 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -72,11 +72,21 @@ abstract class TestCase extends BaseTestCase
 
     protected function assertBillableRateServiceIsUnused(): void
     {
-        $this->mock(BillableRateService::class, function (MockInterface $mock) {
+        $this->mock(BillableRateService::class, function (MockInterface $mock): void {
             $mock->shouldNotReceive('updateTimeEntriesBillableRateForProjectMember');
             $mock->shouldNotReceive('updateTimeEntriesBillableRateForProject');
             $mock->shouldNotReceive('updateTimeEntriesBillableRateForMember');
             $mock->shouldNotReceive('updateTimeEntriesBillableRateForOrganization');
         });
     }
+
+    protected function actAsOrganizationWithSubscription(): void
+    {
+        $this->mock(BillingContract::class, function (MockInterface $mock): void {
+            $mock->shouldReceive('hasSubscription')->andReturn(true);
+            $mock->shouldReceive('hasTrial')->andReturn(false);
+            $mock->shouldReceive('getTrialUntil')->andReturn(null);
+            $mock->shouldReceive('isBlocked')->andReturn(false);
+        });
+    }
 }
diff --git a/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php b/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php
index f9978bac..49c7f204 100644
--- a/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php
+++ b/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php
@@ -251,6 +251,75 @@ class ProjectEndpointTest extends ApiEndpointTestAbstract
         ]);
     }
 
+    public function test_store_endpoint_ignores_estimated_time_if_pro_features_are_disabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'projects:create',
+        ]);
+        $projectFake = Project::factory()->forOrganization($data->organization)->make();
+        Passport::actingAs($data->user);
+
+        // Act
+        $response = $this->postJson(route('api.v1.projects.store', [$data->organization->getKey()]), [
+            'name' => $projectFake->name,
+            'color' => $projectFake->color,
+            'is_billable' => $projectFake->is_billable,
+            'estimated_time' => 10000,
+        ]);
+
+        // Assert
+        $response->assertStatus(201);
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', $projectFake->name)
+            ->where('data.color', $projectFake->color)
+            ->where('data.estimated_time', null)
+        );
+        $this->assertDatabaseHas(Project::class, [
+            'name' => $projectFake->name,
+            'color' => $projectFake->color,
+            'organization_id' => $projectFake->organization_id,
+            'is_billable' => $projectFake->is_billable,
+            'estimated_time' => null,
+        ]);
+    }
+
+    public function test_store_endpoint_can_store_project_with_estimated_time_with_pro_features_enabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'projects:create',
+        ]);
+        $projectFake = Project::factory()->forOrganization($data->organization)->make();
+        Passport::actingAs($data->user);
+        $this->actAsOrganizationWithSubscription();
+
+        // Act
+        $response = $this->postJson(route('api.v1.projects.store', [$data->organization->getKey()]), [
+            'name' => $projectFake->name,
+            'color' => $projectFake->color,
+            'is_billable' => $projectFake->is_billable,
+            'estimated_time' => 10000,
+        ]);
+
+        // Assert
+        $response->assertStatus(201);
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', $projectFake->name)
+            ->where('data.color', $projectFake->color)
+            ->where('data.estimated_time', 10000)
+        );
+        $this->assertDatabaseHas(Project::class, [
+            'name' => $projectFake->name,
+            'color' => $projectFake->color,
+            'organization_id' => $projectFake->organization_id,
+            'is_billable' => $projectFake->is_billable,
+            'estimated_time' => 10000,
+        ]);
+    }
+
     public function test_store_endpoint_fails_if_name_is_already_used_in_organization(): void
     {
         // Arrange
@@ -507,6 +576,71 @@ class ProjectEndpointTest extends ApiEndpointTestAbstract
         $this->assertFalse($project->is_archived);
     }
 
+    public function test_update_endpoint_ignores_estimated_time_if_pro_features_are_disabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'projects:update',
+        ]);
+        $project = Project::factory()->forOrganization($data->organization)->create();
+        $projectFake = Project::factory()->make();
+        Passport::actingAs($data->user);
+
+        // Act
+        $response = $this->putJson(route('api.v1.projects.update', [$data->organization->getKey(), $project->getKey()]), [
+            'name' => $projectFake->name,
+            'color' => $projectFake->color,
+            'is_billable' => $projectFake->is_billable,
+            'estimated_time' => 10000,
+        ]);
+
+        // Assert
+        $response->assertStatus(200);
+        $project->refresh();
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', $projectFake->name)
+            ->where('data.color', $projectFake->color)
+            ->where('data.estimated_time', null)
+        );
+        $this->assertSame($projectFake->name, $project->name);
+        $this->assertSame($projectFake->color, $project->color);
+        $this->assertNull($project->estimated_time);
+    }
+
+    public function test_update_endpoint_can_store_project_with_estimated_time_with_pro_features_enabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'projects:update',
+        ]);
+        $project = Project::factory()->forOrganization($data->organization)->create();
+        $projectFake = Project::factory()->make();
+        Passport::actingAs($data->user);
+        $this->actAsOrganizationWithSubscription();
+
+        // Act
+        $response = $this->putJson(route('api.v1.projects.update', [$data->organization->getKey(), $project->getKey()]), [
+            'name' => $projectFake->name,
+            'color' => $projectFake->color,
+            'is_billable' => $projectFake->is_billable,
+            'estimated_time' => 10000,
+        ]);
+
+        // Assert
+        $response->assertStatus(200);
+        $project->refresh();
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', $projectFake->name)
+            ->where('data.color', $projectFake->color)
+            ->where('data.estimated_time', 10000)
+        );
+        $this->assertSame($projectFake->name, $project->name);
+        $this->assertSame($projectFake->color, $project->color);
+        $this->assertSame(10000, $project->estimated_time);
+    }
+
     public function test_update_endpoint_does_not_update_billable_rates_of_time_entries_if_billable_rate_is_unchanged(): void
     {
         // Arrange
diff --git a/tests/Unit/Endpoint/Api/V1/TaskEndpointTest.php b/tests/Unit/Endpoint/Api/V1/TaskEndpointTest.php
index a8076080..e1ed06e9 100644
--- a/tests/Unit/Endpoint/Api/V1/TaskEndpointTest.php
+++ b/tests/Unit/Endpoint/Api/V1/TaskEndpointTest.php
@@ -10,6 +10,7 @@ use App\Models\ProjectMember;
 use App\Models\Task;
 use App\Models\TimeEntry;
 use Illuminate\Support\Carbon;
+use Illuminate\Testing\Fluent\AssertableJson;
 use Laravel\Passport\Passport;
 use PHPUnit\Framework\Attributes\UsesClass;
 
@@ -274,7 +275,7 @@ class TaskEndpointTest extends ApiEndpointTestAbstract
         $response->assertJsonCount(2, 'data');
     }
 
-    public function test_store_endpoint_fails_if_user_has_no_permission_to_create_tasks()
+    public function test_store_endpoint_fails_if_user_has_no_permission_to_create_tasks(): void
     {
         // Arrange
         $data = $this->createUserWithPermission();
@@ -347,7 +348,7 @@ class TaskEndpointTest extends ApiEndpointTestAbstract
         ]);
     }
 
-    public function test_store_endpoint_creates_new_task_if_user_has_permission_to_create_tasks()
+    public function test_store_endpoint_creates_new_task_if_user_has_permission_to_create_tasks(): void
     {
         // Arrange
         $data = $this->createUserWithPermission([
@@ -371,6 +372,71 @@ class TaskEndpointTest extends ApiEndpointTestAbstract
         ]);
     }
 
+    public function test_store_endpoint_ignores_estimated_time_if_pro_features_are_disabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'tasks:create',
+        ]);
+        $project = Project::factory()->forOrganization($data->organization)->create();
+        Passport::actingAs($data->user);
+
+        // Act
+        $response = $this->postJson(route('api.v1.tasks.store', [$data->organization->getKey()]), [
+            'name' => 'Task 1',
+            'project_id' => $project->getKey(),
+            'estimated_time' => 3600,
+        ]);
+
+        // Assert
+        $response->assertStatus(201);
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', 'Task 1')
+            ->where('data.project_id', $project->getKey())
+            ->where('data.estimated_time', null)
+        );
+        $this->assertDatabaseHas(Task::class, [
+            'name' => 'Task 1',
+            'project_id' => $project->getKey(),
+            'organization_id' => $data->organization->getKey(),
+            'estimated_time' => null,
+        ]);
+    }
+
+    public function test_store_endpoint_can_store_with_estimated_time_with_pro_features_enabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'tasks:create',
+        ]);
+        $project = Project::factory()->forOrganization($data->organization)->create();
+        Passport::actingAs($data->user);
+        $this->actAsOrganizationWithSubscription();
+
+        // Act
+        $response = $this->postJson(route('api.v1.tasks.store', [$data->organization->getKey()]), [
+            'name' => 'Task 1',
+            'project_id' => $project->getKey(),
+            'estimated_time' => 3600,
+        ]);
+
+        // Assert
+        $response->assertStatus(201);
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', 'Task 1')
+            ->where('data.project_id', $project->getKey())
+            ->where('data.estimated_time', 3600)
+        );
+        $this->assertDatabaseHas(Task::class, [
+            'name' => 'Task 1',
+            'project_id' => $project->getKey(),
+            'organization_id' => $data->organization->getKey(),
+            'estimated_time' => 3600,
+        ]);
+    }
+
     public function test_update_endpoint_fails_if_user_has_no_permission(): void
     {
         // Arrange
@@ -523,6 +589,63 @@ class TaskEndpointTest extends ApiEndpointTestAbstract
         ]);
     }
 
+    public function test_update_endpoint_ignores_estimated_time_if_pro_features_are_disabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'tasks:update',
+        ]);
+        $task = Task::factory()->forOrganization($data->organization)->create();
+        Passport::actingAs($data->user);
+
+        // Act
+        $response = $this->putJson(route('api.v1.tasks.update', [$data->organization->getKey(), $task->getKey()]), [
+            'name' => $task->name,
+            'estimated_time' => 3600,
+        ]);
+
+        // Assert
+        $response->assertStatus(200);
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', $task->name)
+            ->where('data.estimated_time', null)
+        );
+        $this->assertDatabaseHas(Task::class, [
+            'id' => $task->getKey(),
+            'estimated_time' => null,
+        ]);
+    }
+
+    public function test_update_endpoint_can_update_estimated_time_with_pro_features_enabled(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'tasks:update',
+        ]);
+        $task = Task::factory()->forOrganization($data->organization)->create();
+        Passport::actingAs($data->user);
+        $this->actAsOrganizationWithSubscription();
+
+        // Act
+        $response = $this->putJson(route('api.v1.tasks.update', [$data->organization->getKey(), $task->getKey()]), [
+            'name' => $task->name,
+            'estimated_time' => 3600,
+        ]);
+
+        // Assert
+        $response->assertStatus(200);
+        $response->assertJson(fn (AssertableJson $json) => $json
+            ->has('data')
+            ->where('data.name', $task->name)
+            ->where('data.estimated_time', 3600)
+        );
+        $this->assertDatabaseHas(Task::class, [
+            'id' => $task->getKey(),
+            'estimated_time' => 3600,
+        ]);
+    }
+
     public function test_delete_endpoint_deletes_tasks_if_user_has_permission(): void
     {
         // Arrange
diff --git a/tests/Unit/Model/UserModelTest.php b/tests/Unit/Model/UserModelTest.php
index 9444154d..56f2840b 100644
--- a/tests/Unit/Model/UserModelTest.php
+++ b/tests/Unit/Model/UserModelTest.php
@@ -92,7 +92,10 @@ class UserModelTest extends ModelTestAbstract
         // Assert
         $this->assertNotNull($timeEntriesRel);
         $this->assertCount(3, $timeEntriesRel);
-        $this->assertTrue($timeEntriesRel->first()->is($timeEntries->first()));
+        $this->assertEqualsCanonicalizing(
+            $timeEntries->pluck('id')->toArray(),
+            $timeEntriesRel->pluck('id')->toArray()
+        );
     }
 
     public function test_it_has_many_project_members(): void