The longest I've ever stayed up has been about 30 hours, but whenever this happens there is typically alcohol involved somewhere. I would never "willingly" stay up 24 hours or more because I really love sleep and I like doing it and sometimes sleep seems more appealing than playing video games or homework or w/e you guys' excuses are. Usually if I'm up for 12 hours then I feel it's sleep time. Without 10 hours of sleep I do not feel refreshed at all, just very very tired.