> had I done it myself it might have taken 15-20min as well.

Could you spend that 15-20min on some other task while this one works in the background?

Well the 15 minutes code review are still there.

Not really, or I guess I could if i let it run wild. But I wanted to check what it was doing and had to steer it in other directions sometimes.

I treat it as pair programming with a junior programmer on speed!