I know my view isn't in line with the current trend, but I still think that rapid mood swings, as in hours or a day or two, are not indicative of bipolar disorder. If you look at the DSM criteria it always mentioned prolonged periods of time. In other words I don't believe in ultra cycling bipolar disorder at all and a lot of people with a bipolar disorder diagnoses actually have BPD.

This said I am not a medical professional and it's really just an uneducated opinion.