In my case, depression usually lasts between a few months and over a year (I've had 5 or 6 depressive episodes so far); hypomania lasts between 4 days and a few months (I've had 4 or 5 episodes) and mania lasts 3 weeks (I've only had one, with psychotic symptoms). How is it for you?
And is it normal for bipolar people to have depressive and hypomanic episodes (apparently bipolar 2) and then suddenly have a manic episode (appparently bipolar 1)?