Think about it, You take a large amount of criminals(possibly violent offenders) and lock them inside a cage inside another cage inside a building. so there treated like animals all day and cant do...
There is no set amount. It all depends on the size of the facility.
I was in one in 1969, but I can find no record of this any where on the Internet.
it depends on the country specific and the crimes
26 total, 24 male & 3 female (9 federal)