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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:
The precise answer to that question depends to a large extent on storage conditions - refrigerate pasta within two hours of cooking. To maximize the shelf life of cooked pasta for safety and quality, refrigerate the pasta in shallow airtight containers or resealable plastic bags.