I've had some crazy ass experiences with this shit. Fortunately I learned my lesson quick and stopped binging for 5 days or more after my second run-in with amphetamine psychosis. Due to having used lots of LSD and assorted hallucinogens, the hallucinations don't really bother me, until day 5 comes around and I become so delusional that I begin talking to completely imaginary people while alone, or worse yet, begin projecting imaginary traits on to real people and have conversations that go beyond fucked up. Nobody likes to have crazy, nonsensical paranoid accusations thrown at them.
I also ran into some imaginary people during an 8 day brief psychotic episode, except I was in imaginary places as well. So not cool.
My binges go no longer than three days anymore (usually including comedown time, provided I stop at the right time), 4 isn't even worth it. Actually more like 2 days lately, but three is the absolute limit. The moment I can't concentrate on reading a page or doing relatively simple math anymore, shit has to end.