Ever find yourself faced with a tray of leftover snacks after a party wondering if you should save or toss them? Usually, logic sort of goes out the window and smell and taste kick in to determine their refrigerator shelf life. But have you tried the 2:4 rule? Wonder no longer! The 2:4 rule is simple: store leftovers within two hours and consumed the leftovers within four days. Leftovers shouldn't sit out at room temperature longer than two hours or the risk of food contamination starts to grow. And four days in the refrigerator ensures against food spoilage. Can you push both of these limits a little? Sure.