Hard to say. You'd have to see a pdoc (psychiatrist). Usually episodes of hypomania or mania last at least a few days, if not weeks or months. Depressive episodes will also last usually at least a couple weeks, but often times much more. I'm BP Type I, so the durations between mood swings are pretty long. I've been in a persistent, but mild hypomanic state for several months, though I think it's likely to be drug induced (lamictal). Usually serious symptoms don't really manifest until the early 20's, but who knows?