Rapid is four or more times a year. Ultra Rapid is within days, and Utradian, or Ultra-Ultra Rapid is within the day. Most people use the words rapid cycling to describe within the day, but this isn't correct. Pdocs don't do a very good job educating their patients with this either. Rapid cycling can be major depression, mania, hypomania or mixed but is not specific to certain moods. I hope that helps a bit.