Are you gearing up for the holidays by pulling out all of your old family recipes? Some of us love holiday eating more than holiday cooking, but whatever side you're on, almost everyone enjoys leftovers. But just how long should you be snacking on them after the holiday party has ended? Leftovers can be kept for three to four days in the refrigerator, but after that, the risk of food poisoning increases. If you don't think you'll be able to eat leftovers within four days, freeze them immediately. When you’re ready to eat, heat them on the stove, oven or microwave until the internal temperature reaches 165 F (74 C).