Everybody is right. The main thing is that you have time to get rest and not add more stress from not sleeping. I always go by what I feel my body needs.

I know this I just slept 12 hours and could go back to sleep right now

I get by on about 4 to 5 hours each night

More than 7 for sure. I'm always sleepy and make time for a quick nap

7 to 8 hours :)