add duration

app/Http/Resources/ToDoResource.php

@@ -19,6 +19,7 @@ class ToDoResource extends JsonResource
             'user_id' => $this->user_id,
             'name' => $this->name,
             'checked' => $this->checked,
+            'duration' => $this->duration,
         ];
     }
 }

app/Models/User.php

@@ -58,7 +58,12 @@ class User extends Authenticatable
 
     public function stopCurrentTimeTracker(): void
     {
-        $this->currentTimeTracker()->update(['end_at' => now()]);
+        $end = now();
+        $delay = $end->diffInSeconds($this->currentTimeTracker->start_at);
+        $toDo = $this->currentTimeTracker->toDo;
+        $toDo->duration = $toDo->duration + $delay;
+        $toDo->save();
+        $this->currentTimeTracker()->update(['end_at' => $end]);
         $this->time_tracker_id = null;
         $this->save();
     }