Around 80 hours (sunday morning till wednesday evening), with 3x1 hour naps during classes. Actually, I was expecting that hallucination thing, but it came around the last hours.
And I kinda liked it, wasn't so vivid, but they were fun.
Oh and at the 3rd day I became somehow hyperactive so everybody were like "what's up with you?!"
Really fun experience, gotta try it again.
By the way, 24-36 hours have become somehow default for me, I see nothing wrong with that.
(I don't play games during that time though, it's more like coffee + movies)