I was inpatient for 30 days, but it was because I was suicidal. I saw my pdoc and social worker everyday. There were groups, but we weren't required to attend any of them. I spent most of my time in my room or in the dining area doing puzzles. I did undergo ECT to get me out of that depressive episode.
I did have 4 weeks in the partial hospitalization program where I did CBT and DBT that I found very helpful.