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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:
FOOD STORAGE â HOW LONG CAN YOU KEEP... MACARONI â COOKED, LEFTOVERS. 1  Refrigerate within two hours of cooking; store in covered containers. 2  Freeze in covered airtight containers or heavy-duty freezer bags.  Baked pasta dishes containing sauce freeze best; cooked dry pasta may become overly mushy when thawed.