Make Ahead: You can make this complete recipe ahead of your event. Leftovers: Boiled peanuts can last 24 hours at room temperature.  If you have any leftovers, it is best to cover them and put in the fridge.  They will last 7 to 10 days if stored properly. Reheating: Put them in a saucepan with water and bring them to a boil, reduce heat, and simmer for 5 minutes.  Crack one open, and if necessary, add one tablespoon of salt and stir.  When ready to eat, drain and enjoy. Freezing: Drain the peanuts, allow them to cool, then freeze in zip-top freezer bags or another airtight container.  They should last up to 6 months.