I believe as long as pellet or flake (dry food) kept dry and basically room temp it will last a very long time. I just finished using a 10 or so year old jar of NLS pellets and they were fine and my fish devoured them just as much as the newer jars that I have.
I agree with the dry food flake/pellets lasting a long time. Refrigerated food like reef nutrition, which is good for about 3-4 months from when it's bottled, I won't keep much past the expiry date.
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