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A: Chopped or sliced onions can be stored in a sealed container in your refrigerator at the proper temperature of 40Â°F or below for 7 to 10 days (Source: USDA). For pre-cut fresh or frozen products, always use and follow manufactures use by dates.
LEFTOVERS: LAST 3 - 4 DAYS. Kung Pao chicken, pepperoni pizza, or tuna salad must go in the fridge within two hours of serving to reduce your risk of food-borne illnesses, because bacteria grow more quickly at room temperature.ut foods don't stay fresh in the fridge forever, and the day will come when you take something out and wonder if it's still good to eat or has gone bad. On The Early Show Monday, ShopSmart magazine Editor in Chief Lisa Lee Freeman had the lowdown on how long foods last in the fridge.