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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.
Best Answer: Realistically, the tuna would last about 3 days refrigerated. However, (assuming you mixed it with some veggies and mayo-ish condiments) the condiments and moisture from the veggies, the mayo and tuna will release their moisture, which soaks into the bread, making the sandwich soggy. just now. Report Abuse. The sandwich would be safe to eat for 3 days. Whether or not you'd want to eat it in 3 days remains to be seen... the bread will get soggy from the tuna salad after about 12 hours.