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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:
Kitchen Fact: Cooked food stored in the refrigerator should be eaten in 3 to 4 days. After food is cooked, it should sit out at room temperature no more than two hours before being refrigerated to slow down bacteria growth.But once stored in the fridge, leftovers should be eaten up within three to four days because bacteria can still grow even at refrigerator temperatures.To help you remember how long something has been in the fridge, we recommend labeling it with the date it was cooked to help you keep track!fter food is cooked, it should sit out at room temperature no more than two hours before being refrigerated to slow down bacteria growth.