Ultramar, I don't know if the OP is bipolar or not. But I can tell you, as someone who has cycled within minutes, that there is such a thing as "ultra-ultra-ultra rapid cycling". Google the term "ultradian cycling bipolar". You will find research articles on bipolar that cycles within a 24 hour period. It is not typical or common, but it DOES happen.

According to the DSM, you're right. A depressive episode must last 2 weeks, a hypomanic episode 4 days, and a manic episode 1 week. But the DSM is far from perfect. When I was first diagnosed, I told the doctor that I didn't think I was bipolar because I cycled too quickly. Her reply? "Not everyone's body conforms to the DSM".

My psychiatrist has told me that I have a "cyclothymic temperament" on top of my bipolar disorder. This makes me susceptible to frequent mood swings, and gives me a very complex cycling pattern. I have depressions that last for months, but during a typical day of depression I will experience tiny pockets of elevated (even to the point of being hypomanic) mood. Perhaps the OP has a similar situation.

I have been evaluated by 4 psychiatrists. They all agree that I'm bipolar. When I ask them if I'm borderline, they look at me funny. I'm clearly bipolar and I have cycled very quickly.