add duration

app/Models/User.php

@@ -6,7 +6,7 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
-use Illuminate\Database\Eloquent\Relations\HasOne;
+use Illuminate\Database\Eloquent\Relations\HasManyThrough;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
@@ -51,6 +51,11 @@ class User extends Authenticatable
         return $this->belongsTo(TimeTracker::class, 'time_tracker_id');
     }
 
+    public function timeTrackers(): HasManyThrough
+    {
+        return $this->hasManyThrough(TimeTracker::class, ToDo::class);
+    }
+
     public function toDos(): HasMany
     {
         return $this->hasMany(ToDo::class);