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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.
Opened jar of commercial mayonnaise: 2 months (refrigerator); don't freeze Opened bottle of ketchup or chili sauce: 6 months (refrigerator) Opened jar of mustard: 1 year (refrigerator) Opened bottle of olive or vegetable oil: 4 months Shredded Parmesan cheese: 1 month (refrigerator) or 3-4 months (freezer)