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Just about every time I fly on a plane I break 30 hours. One time I did 35 hours (with no food either). One time I did about 40-50 (I remember I really wanted to break 50 but I failed, don't remember when though) just to see how long I could go when I was about 13. Then I slept for about 14 hours. I read that no matter how long you've been awake, any amount of sleep beyond 12 hours is a waste, and 12 is the most you'd ever need. After 12 I guess you're just trying to sleep off the headache but not actually recharging anymore.