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.
“Beer is the center of everything. Everything revolves around beer. When you drink beer, everything revolves. Therefore beer is the center of everything.” — University of Waterloo Engineers
Primary/Secondary: Canadian Dallas Dark Coffee Ale
Bottle: Belgian Battering Ram (Tripel), Assassyn (IIPA), I Am GRoot Beer