I'm hesitant to comment on too much because I'm certainly not an expert on the parole system. It may be there may be ways for a parole board, again as Mr. Paterson alluded to, to take an individualized look at the person in question after 25 years and be able to make a judgement call, not only about release, but about when it might be suitable to have another parole hearing.
It's probably going to be pretty clear after 25 years, if you're talking about somebody who's moving in the right direction and may well be eligible in two years, three years, or four years, than somebody who's just never going to get there and maybe imposing a slightly longer time before they come back before the parole board. But again, that's probably something that should be left to those who know more about the parole system than I do.