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Well, I just recently found some old 100 round .22LR boxes in my wife's grandparents house that are at least 15 years old. Worked better than the ones I bought last month. Definitely not climate controlled.
I imagine your question would depend so greatly on storage methods, type and maker of the round that providing any sort of cut and dry - year length - answer will be almost impossible, without resorting to a multiple page essay. Even then it would likely be an educated guess because I don't know of anyone who makes it a point to store ammo long term. Even if it's stockpiled, you cycle through the old first as the new comes in.
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The advantage law is the best law in rugby, because it lets you ignore all the others for the good of the game.
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