I have made one batch of ice cream, and now I need to make another. I have rinsed out the freezer bowl, and when I dried it I noticed that the water had frozen to a thin film of ice. So it is obviously still pretty cold. I am hoping to finish the second batch tonight (at the time of writing it is 7 pm here in Sweden). Is a couple of hours in the freezer enough, or do I need to wait until tomorrow morning?