Honestly it’s not like seeds, the shells change the game, but if kept correctly without a god awful amount of power outages, that last days, the longests I’ve had that I knew was still viable, 7 years?
I blew it when we got hit by Hurricane Ike in 08, if you get the stuff out of the fridge and open it up, you won’t lose it in an instant, just lose a bit of shelf life, but my dumbass forgot about the pollen in the fridge and as the condiments that I left in the fridge got warmer and condensation built up, it got “mushy” in the packs I had. But I’m sure the stuff could have lasted longer if the conditions didn’t go to shit……