Epic Beard Man
Bearded Philosopher
Hell is eternal because there is no concept of time in the metaphysical plane of existence as one cannot measure time since it does not existence therefore things in that plane exist ad infinitum-at least that is what I understand. Near Death Experience or NDE tend to explain this idea through the experience of death by various patients report the lapse in time when they've experienced "heaven" and "hell." For them, these experiences seem like forever (considering that the consciousness is not aware of time after death) but in reality these experiences may be seconds to minutes.