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4-600 seeds if my memory is correct.
I used to do a cold water extract though the results were hit and miss. Grind the seeds in a coffee grinder, add cold water and citrus juice, let sit for a few hours, strain, drink.
The "tea" is disgusting, but when it works it works. Though there is always the possibility that it won't work and you'll have drank that nasty crap for nothing.
You'd be better off finding some real LSD.