The where is easy to see here but the " how long" is not. These guys are switched from AC to regular segregation often. Conditions are the same but it looks different on paper. The question to ask is: how long have you been in isolation? and remember- for some a short time is devastating. Studies have found, and I have found that prisoners that study the law, which is allowed by law, helps the prisoner keep sane. I am told by the long timers though, after a certain number of years deterioration sets in even then.
Waupun Correctional Institution WCI AC (20) https://ffupstuff.files.wordpress.com/2016/05/wci-ac-prisoners4-16.pdf
Green Bay Correctional Institution GBCI AC (3) https://ffupstuff.files.wordpress.com/2016/05/gbci-ac-prisoners-2016.pdf
Wisconsin Secure Program Facility (Supermax formerly- now WSPF) (68)
Columbia Correctional Institution CCI AC prisoners (11)