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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. According to Eat By Date, fresh pasta lasts for four to five days in the refrigerator, and cooked pasta lasts for up to a week when refrigerated. Store fresh or cooked pasta in the freezer for up to eight months. Continue Reading.