It has depended. Like you, I have been more prone to mood elevations (mania or just up to hypomania), but very often they turned mixed. When mixed, they don't seem as "sad" or "depressed" as they do "desperate" and "frustrated", with extreme agitation, often anxiety, and some typical manic symptoms (impulsivity, disinhibition, etc.) I think as far as significant pure depressions, I can count them on one hand.

I've had funks that lasted just a few days to a week. My bona fide depressions were at least a couple/few weeks, with a few lasting months. In the latter cases, I was in the hospital (ECT) or at home on disability. Again, there were many more mixed states, with various levels of severity and length. My absolute worst episodes, with psychosis, were manic episodes with mixed features. I also had some mixed that leaned more on the depressive end. I like how the DSM-5 included these specifiers. It fit my situations well.