I disagree. Isolation in a cell is the most severe form of torture humanly possible.
If someone with a 50 year sentence was a high profile case like Sandusky, they would be constantly isolated from other prisoners and have their meals delivered to them. If they slept 12 hours a day (which they wouldn't because some prisons don't let you sleep as long in solitary confinement) they will be awake, alone, with nothing to do for 218,400 hours. Sit in your bathroom tub for an hour and do nothing, and then multiply that by 218,400. It's horrible.