How long will it last?

You cannot let water or humidity in though as this will make it go bad in a day or two. If you're looking to pollinate this season I wouldn't use a fridge at all, but store it in a dry box or sth. If you want to store it for next year or so, the only way is to mix it with flour and then freeze it.
 
Ah and if you really need some help then... :) get the support from The Mountain (link below).
 
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