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If it is a commercially frozen lasagna, it should be kept in the freezer until it is taken out to be cooked. Once it has been cooked, the leftover lasagna can be kept safely in the refrigerator for up to two days in a covered container. Learn more about Food Spoilage Sources:
Quick Answer. Cooked pasta lasts 3 to 5 days in the fridge according to Better Homes and Gardens. It should be stored in airtight containers, and sauces should be stored separately if possible. Keep Learning.