In my current stages of unemployment and sheer boredom, I've been testing myself as of late. I've had plenty of 26+ hour awake times... filled mostly with COD4, Jolt Energy, and 5 hour energy. I'm getting better though, as last night and the night before I actually went to bed at a reasonable hour.
All this will be impossible once I start my new job... I start at 5 AM
I have insomnia but I just take a pill to make me go sleepy if I can't lol.
But, the longest for me was around 36 hours give or take one. I don't remember why I did it, but it was a few friends and me.