You can easily make these pinwheels the night before or up to 24 hours in advance. I recommend leaving the pinwheels in long rolls and slicing just before serving for the best results. The pinwheels will keep their shape a little better if you slice right before serving for a party as an appetizer. You can slice these pinwheels and place in a lunchbox or cooler ahead of time for a picnic, but they do need to be kept cold.