I am bipolar 2 and have barely had any euthymic states in between episodes since I've been an adult. My depressive episodes can last anywhere from 2 months to 18 months, and my hypomanic episodes typical last between 2 and 7 months. I also have had mixed state episodes that last about the same length as the hypomanic episodes. My cycle is basically like:

Depression
Hypomania
Mixed State
Depression
Euthymia
Mixed state
Euthymia
Hypomania
Depression

Etc....

Does anyone else experience these types of long episodes? Almost like cyclothymia except my depressive episodes are extremely debilitating and my hypomanic episodes are very intense.