For me, ~22 hours. On the day before my first day of school.
75 hours. wasn't easy.
Just 22 :((
If it were not for parents that one day, I may have skipped the whole day's sleep and make it 36 or more...
72 hours. I really don't recommend staying up that long, I only did it cause someone challenged me to do it.
21 hours. From 7:00am to 4:00am.