> Time investment: 10 mins to review the code

This is what really irks me about take home exercises. The candidate spends 2-4 hours (or 12 and say they did it in 2) and the interviewer has no real commitment to reading and understanding it. 10 minutes to review the code? I would expect a video call where we go over the code together.

All interviewing I do, I do while talking to them and give them ample time to explain it back to me.

The candidate is investing their time. You should have enough respect to invest your time too.