diff --git a/database/migrations/2025_04_25_202047_change_data_type_for_spent_time_columns.php b/database/migrations/2025_04_25_202047_change_data_type_for_spent_time_columns.php
new file mode 100644
index 00000000..03ca6acf
--- /dev/null
+++ b/database/migrations/2025_04_25_202047_change_data_type_for_spent_time_columns.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->bigInteger('spent_time')->unsigned()->default(0)->change();
+        });
+        Schema::table('tasks', function (Blueprint $table): void {
+            $table->bigInteger('spent_time')->unsigned()->default(0)->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->integer('spent_time')->unsigned()->default(0)->change();
+        });
+        Schema::table('tasks', function (Blueprint $table): void {
+            $table->integer('spent_time')->unsigned()->default(0)->change();
+        });
+    }
+};
diff --git a/tests/Unit/Model/ProjectModelTest.php b/tests/Unit/Model/ProjectModelTest.php
index c9056514..1c417829 100644
--- a/tests/Unit/Model/ProjectModelTest.php
+++ b/tests/Unit/Model/ProjectModelTest.php
@@ -185,4 +185,19 @@ class ProjectModelTest extends ModelTestAbstract
         // Assert
         $this->assertFalse($isArchived);
     }
+
+    public function test_project_can_store_big_amounts_of_spent_time(): void
+    {
+        // Arrange
+        $project = Project::factory()->create();
+        $spentTime = 100 * 365 * 24 * 60 * 60; // 100 years in seconds
+
+        // Act
+        $project->spent_time = $spentTime;
+        $project->save();
+        $project->refresh();
+
+        // Assert
+        $this->assertSame($spentTime, $project->spent_time);
+    }
 }
diff --git a/tests/Unit/Model/TaskModelTest.php b/tests/Unit/Model/TaskModelTest.php
index 144f3718..3e7a9a6f 100644
--- a/tests/Unit/Model/TaskModelTest.php
+++ b/tests/Unit/Model/TaskModelTest.php
@@ -114,4 +114,19 @@ class TaskModelTest extends ModelTestAbstract
         // Assert
         $this->assertFalse($task->is_done);
     }
+
+    public function test_task_can_store_big_amounts_of_spent_time(): void
+    {
+        // Arrange
+        $task = Task::factory()->create();
+        $spentTime = 100 * 365 * 24 * 60 * 60; // 100 years in seconds
+
+        // Act
+        $task->spent_time = $spentTime;
+        $task->save();
+        $task->refresh();
+
+        // Assert
+        $this->assertSame($spentTime, $task->spent_time);
+    }
 }