3 days is my limit. Did it last time I was in Vegas. I find that you start to kinda see "shadow people" out of the corner of your eyes after about the 48 hour point.
Cocaine is a hellva drug!
I once stayed up about 2.5 days w/o drugs and I saw to when I went to put my shoes on one morning there was spider webs in them, or so I thought. I notice my vision gets really bad, things blur, and you start seeing shit. Never understood how people would want to do Meth if it makes you stay up for 5+ days. I would go insane, guess it explains why 90% of the people getting busted on Cops are strung out of their mind on that shit.