I haven't read through the entire thread yet but I'd like to share my personal experience.
When I was younger I found myself in some trouble for which I accept full responsibility for. I spent 9 months behind bars. In the very beginning of the term I politely refused to be transferred to a different institution due to overcrowding. At the time I wasn't sure I'd be staying the entire sentence as I had the opportunity to get out (PO Hold). My punishment was a 10 day stay in the hole.
Let me tell you that the days in there alone, with no light or anything to do played tricks on my mind. You're on suicide watch by default. The smell is awful, depression kicks in and you certainly contemplate a number of things in your head that can be the onset of other mental furies.
Theories say the first 48-hours of being institutionalized are the most influential on an incarcerated subject. Past that time frame you begin to deteriorate.
Minimum daily rate: $1000