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1 When freezing a cake, be sure that it is completely cooled before wrapping. 2  Wrap the cake tightly in plastic wrap and then wrap it again in foil before placing it in the freezer. 3  If you do not have time to freeze the cake overnight, freezing it for 2 or 3 hours will help when it comes time to decorate it. Place the frosted cake on a solid flat surface that can be used to hold the cake when placed in the freezer, such as a cookie sheet, cake board, or cutting board. 2  Place the unwrapped cake in the freezer. 3  Freeze unwrapped until the frosting and decorations are frozen hard.
Best Answer: If it is royal icing it is dependant on how thick you have made the icing. I haven't done mine yet I've been a bit lazy this year. Yours will be fine for Christmas day. It normally takes a couple of days to really set properly. Whatever you do don't put the cake in a fridge, just store it in a cool place.