^Why?
Personally I would say that morality isn't about punishing bad people, it's about fixing problems and getting people to treat each other better. Punishment is part of that, but hurting people is not the goal, it is a means to an end. Eternal hell, or any gratuitous punishment that goes beyond what is needed to stop people from doing bad things is immoral.
If your asking "What amount of torture does this guy deserve?" you are asking the wrong question. The right question is "What will make the world a better place?" So please tell me, how does torturing people forever make the world a better place?