I once did four days with a 3 hour sleep once and at the end was still fresh as a daisy. People at college complimented how I looked and that with no sleep for days.
I've only ever pulled two all nighters, the first was for prom, obviously, which was about 24 hours.
The second was for my stats exam.... shudder. I had a huge assignment due on the day of the final exam, and between studying and trying to get the assignment done, I just didn't have time to sleep. I studied all day friday, worked on the assignment all night, then went and wrote the exam the next morning (yes the exam was on a ****ing saturday). After I got home, I still had to FINISH the assignment which took another couple of hours. After that I passed out for about 16 hours.
I need my sleep, when I get less than eight hours I'm not a very fun person to be around.
About a day and half. Woke up at like 7am, went to airport hotel that night. Could not sleep literally at all, went on a flight the next morning, spent the next day around wherever the hell I was and then crashed that night. So thats almost 2 days