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Not too sure on duration. But... the standard EMIT type test (the dip strip type which is most common) is usually a five or nine panel and most will not test for psilo.
If its GCMS at a lab, well ya never know what they'll look for or find. But if they are looking for it, they'll find it.
Erowid says 1-3 days detection time, for what its worth.
Good luck
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