Cover the cake in plastic wrap and put it in the fridge for at least 4 hours. I like to make this cake the night before, so it's served much later than 4 hours. When people tell me their cake wasn't as good as mine, I KNOW this is why! Make it the night before, and you will be amazed :) Try some after 4 hours, and try some the next day, and tell me I'm wrong!?!