Naruto begins to train with Kakashi. Kakashi finds it exhausting working with Naruto, who can’t understand anything explained to him.
it'll take half the time it takes
to train alone.
فستتقلّصُ مدّة التدريب إلى النصف
impiegherai la metà del tempo 
che impiegheresti da solo.
demora metade do tempo
 que treinar sozinho.
уйдёт вдвое меньше времени.