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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.
1 Shredded Parmesan cheese: 1 month (refrigerator) or 3-4 months (freezer). 2  Opened jar of natural peanut butter: 4 to 6 months (refrigerator) or 2-3 months (freezer). 3  Opened jar of pasta sauce: 4 days (refrigerator). 4  Unopened coffee jar: 2 years (pantry).