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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:
How long can you keep cooked shrimp in the fridge? Refrigerated cooked shrimp lasts up to 4 days when stored in the coldest part of the refrigerator away from the door. Cooked shrimp should be completely cooled and refrigerated within 2 hours of cooking, using an airtight food storage bag or container.