Comment by fluoridation

Nah. Everything I've read about hallucinogens says dose doesn't change effect duration, only intensity. Drugs do affect people differently, so I wouldn't jump straight to saying they're exaggerating.

Also, 12 hours is definitely not short of LSD. I'd say it's the standard duration, with the peak lasting 7 hours. Longer trips can happen, at least to some people, but the default assumption should be about half a day.