Just as long as you keep it away from light and humidity, as well as storing in air tight container, it can last months like that. A good idea is to put an object in the container that would suck up any moisture in the container. For example I recently just got my seeds for my grow thats starting mid april and I'll did was put them in a plastic bag with napkins inside, and place that in a box. Don't play with it and crap just leave it alone and it'll stay good