During my military training, in a war-game exercise, during the most hectic days a total of 114h awake, with 6 hours of sleep total here and there in between.
It was murder. We had people beginning to hallucinate while awake. To stop any physical activity even for a second was to fall asleep while standing and with eyes open.
But then again, that was part of the excersice: to teach us the limits of our own bodies and minds and what the absolutely screaming need for sleep does to us.
Disregarding that, at a LAN party 50h of gaming, playing pool, watching competitions etc and 5 hours of sleep total that weekend.