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Dried cracker dry, powdered, in airtight container with little or no space for air, at LEAST a year, probably more.
BTW, that's not half-life you're asking about, its shelf-life!
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air tight glass jar, desiccant packets, keep in cool dark spot, should last forever, I have heard many stories of shrooms being stored like this and them not dropping in potency. I also saw someone post something about shrooms being found in pyramids and the actives hadn't lost much potency at all or something.
So yeah air tight jar, unless you can use a pyramid, jar is probably your best bet though