app\models\Task::getDuration PHP Method

    public function getDuration()
    {
        return self::calcDuration($this);
    }

 public function transform(Task $task)
 {
     return ['id' => (int) $task->public_id, 'account_key' => $this->account->account_key, 'user_id' => (int) $task->user->public_id + 1, 'description' => $task->description, 'duration' => $task->getDuration()];
 }