I did 60 hours my freshman year. I was then I can't get out of bed sick for 3-4 days. My roommate had a whip and was whipping the air, except he clipped the smoke alarm setting it off. It took over an hour to get a janitor to come up, check it out and fix it. I was too sick to move and wanted him to die a slow painful death.

2nd time in Vegas I slept for 4 hours out of 64 I think. Really I recommend 4 hours a night whether you need it or not. 4-6 is a good amount because you wake up and you're still drunk so you by-pass hangovers.