from the erowid LSD FAQ
Tolerance:
Aquired rapidly, within 3 days. Tolerance dissipates equally rapidly, without withdrawal, craving, or symptoms of addiction.
Cross-tolerance can and is developed between other indole hallucinogens, eg, DMT, LSD and Psilocybin.
so if i were to trip this weekend, i would wait at least until next weekend (7 days) to trip again.
btw, wrong forum!
[ 13 December 2001: Message edited by: jellie bellie ]