Most cakes have no need to be refridgerated and can stay out, covered in a box or cake case, for up to 5 days with no problems. However if the cream ratio is higher than the sugar ratio then you will need to refridgerate the cake. If you have a fondant covered cake remember that when you remove it from the fridge there will be condensation that will appear on the surface and you will need to give it time to evaporate. Any royal icing decorations may melt with the condensation so you will need to keep that in mind when putting the final decorations on your cake if it needs to go in the fridge.
If the sugar ratio to cream ratio is higher then the sugar acts as a preservative and your cake will be fine covered on the counter.
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