My hypomania lasted from February-May, so 4 months. Then I was manic in June for a few weeks, then became psychotic. I've been in the hospital 4 times since June. Every time I discharged from hospital, returned quickly. Hypomanic for a day or two, manic for a day or two, then all the sudden psychotic almost out of the blue.

Also, mine is definitely affected by the seasons. I get high in the approaching spring and during the summer, and depressed when it starts to get colder.