No one. I think that I read it somewhere.
I suppose, technically they could last ten to twelve but you would have to count every last vestige of effect.
There are many who are surprised at the short duration and quite a few will extend things with a second dose at hour two or three for the express purpose of more time.
Figure half to an hour to feel it at all. Forty five minutes to an hour and a half to peak, quick waves with high troughs for the next two to four and then a rather quick come down. I think to a land of peace in a few hours after your last slope down.
LSD is far longer, the troughs are lower so the waves more pronounced. I can recall times when I actually figured "oh shit, I guess it's over, that was pretty short" and then, like having passed into the eye of a hurricane, the wind and commotion and violence picked up. If you are on the up side, even stronger than the last wave.
Never had pronounced waves in mushrooms, more of an ebb then flow. You never really get to catch your breath.
Mescaline? If there are waves they are either very subtle or maybe very very quick.
Anyway, no, mushrooms are at the very most eight hours and that is on heroic doses.
