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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.
The expiration date is a couple weeks away but I'm sure if I left it in there for a couple weeks after it had been opened, it'd no longer be good. On my fat free cream cheese, it says keep only ten days after opening, even though it doesn't expire for 3 weeks. That's more what I'm looking for but with cottage cheese.