How Long Will A Cake With Buttercream Icing Last?

How Long Will A Cake With Buttercream Icing Last? Kept in the fridge, cake with buttercream or ganache topping will last for 3-4 days. If the cake has custard, cream, cream cheese or fresh fruit it will last 1-2 days at most. How do you store a cake with buttercream frosting? A decorated cake with