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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:
Refrigerate cooked shrimp within two hours of cooking. Shrimp stays good for only two hours after it's cooked and served. On the serving tray in temperatures of 40 degrees Fahrenheit or above, the cooked shrimp begins to fall victim to dangerous bacterial growth when two hours have passed. After this time, the cooked shrimp cannot be refrigerated, frozen or eaten; you must throw it away. In temperatures of 90 F and above, the cooked shrimp lasts only an hour.