http://www.peteearley.com/thomas-silverstein/
A court recently ruled that his conditions did not constitute a violation of the 8th amendment:
http://solitarywatch.com/2013/09/25/federal-appeals-court-co...
It is scary to think that while this article start out with an example of "almost 10,000 hours" in isolation as something horrific, here is a prisoner in the US who has been in isolation more than 20 times longer than that, and the courts have upheld this treatment as legal.