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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:
According to The Daily Meal, cooked shrimp is safe to eat for up to 72 hours after preparation when refrigerated. Raw shrimp and scallops should be refrigerated, tightly covered and used within two days. Continue Reading.