Eating out usually means leftovers to eat later. A common question is how long do stored leftovers last in the refrigerator? The USDA says that leftovers can be eaten within 3-4 days if properly and safely stored. That means refrigerating leftovers within 2 hours (1 hour in hot temperatures.) Reheat meals that contain meat to at least 165 degrees by checking with a food thermometer. Preheat in the oven set to no lower than 325 degrees. Preheat in a microwave by covering and rotating foods for even heating.