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I'd say tolerance. It varies from person to person. My tolerance for mushrooms/LSD takes 3-4 weeks to go away completely. Would recommend wating at least one and a half to two weeks next time.
I bought an eighth four days ago and tripped balls with my girl and my friend whom both took half an eighth, and it last for a good four hours... and two days after I bought another eighth, and only felt a minor change, but never actually peaked