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A: Once your canned tuna has been opened it must be kept in a refrigerator if you did not eat all of it. If wrapped properly and stored in your fridge it should last for around three days.
I've eaten a number of commercially canned foods that were years past the labeled expiration date including a can of tuna that was something like 5 years out from the labeled date. Check to make sure the can isn't compromised in some way and absolutely be sure that it's not ballooned up.