I would assume since it is dried, it should last quite awhile. I just bought some from a spice shop this past weekend for a White IPA and plan to keep it around a bit. Or if you're really worried about it, you can just make a tincture with all of it and that will definitely last a long time.
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Bottle: Belgian Battering Ram (Tripel), Assassyn (IIPA), I Am GRoot Beer