One quarter at finals I stayed up for three days with about 4 hours of sleep. Cigarettes, super-caffeinated drinks, and some wake up pills from a friend of mine (lol) kept me going til after that last final. When I got home and went to sleep (at like 10am after my last final) I slept til early the next morning, waking up for about an hour to eat.
I read or saw on tv once or something that as part of a promotion a radio host stayed on the air and awake for like a week or two once. He ended up suddenly dying a few months later.