I spent 29 years in solitary confinement (2010)
and there is even worst: here exceptional testimony of  Madagascar's thirty years imprisonment in a recent very book (french only, unfortunately) I suggest<p><a href="http://www.plon.fr/ouvrage/la-sentinelle-de-fer/9782259243544" rel="nofollow">http://www.plon.fr/ouvrage/la-sentinelle-de-fer/978225924354...</a>