Badger?
Honestly, though, do you mean test detectably (which I don't know, but would guess about a month) or with effect (which depends on how you take them. I would say major effects are over within 4 hours, but minor effects continue for up to 3 days, though by the end of that it's just a worn out feeling.)
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Light a man a fire, and he will be warm while it burns.
Set a man on fire, and he will be warm for the rest of his life.
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