It really depends where you live and what type of cake you are making. If it is a cheese cake, you need to store it in the fridge, which can last about up to 3 days. If it is a sponge cake, you can store it in a cool dark place, which can last up to 4 days. It its also helpful to check the smell before eating it. If you have any doubt, be safe and bin it.

If you want to store it for longer time, you can freeze it, which usually can last to up a month. However, the flavour may not taste as good as fresh made.