ive heard different legnths of storage from 4 months to over a yr and a half(read they had success multiple times).
cool dark place ive heard most people say freezer or fruit section in fridge
in sealable gram vials, i just bought 20 brown 1 gram vials to store my pollen
and if it were me i would put the vials in tuppoware with a substance in the tuppoware to collect the moisture