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There are several 'camps' at Guantanamo in which conditions are extreme isolation. At one of those, at least, there is enough noise to prevent sleep. Damage from extreme isolation and sleep deprivation takes less than 10 days to start, no more than 30 to have permanent effects.
I started to write something similar to Shooter McGavin's comment, but got interupted:
If he after a month or two in office, he fails to close Gitmo, or makes a move towards the establishment of some court with evidentiary rules that diverge from our legal traditions or moral principle, you and I can link arms and scream bloody murder together.
People haven't been paying attention if they think that these folk can afford any more time at all under the conditions they are being held in.
Your comment was much more eloquent and informed than any I could have written.