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The last time i dropped acid was in early november, which was a low level 3 trip, my last major trip in late october (i was peaking level 4, at one point i imagined a rug was teling me to enjoy the company of my friends and i had visions of the sun god).
anyway, almost 2 months later, i am still experiencing visuals. tracers, negative afterimages, visual snow/rain, some aeropsia in there, extremelly heightened color and pattern recognition, and a harmless form of dyslexia (when i want to, i can rearrange words pretty easily). when i smoke tree, i am pretty much tripping. even while sober, i can make myself experience moderate visuals like the brightening and unbrightening of tints of colors.
ANYWAY, how long does hppd generally last? because i love it! i never want it to go away. it really is heigtened perception!