Banana bread can be stored at room temperature in plastic wrap for a couple of days and up to a week in the fridge. It also freezes well - just wrap in plastic wrap first, then foil before placing in freezer. When ready to defrost, thaw overnight in its wrappings which are taken off when it has reached room temperature. At that point, the loaf can be placed in the oven at 160C (325F) for 10 minutes to rewarm.