24 years is the absolute minimum. The Judge specifically said that they will not be automatically eligible for parole in 24 years, but that they will definitely not be considered for, nor allowed to request parole until that time is up. Releasing them on license would be, in effect, a death penalty I would imagine (and hope).  Far too lenient in my opinion. I think we need a 'You will die in Prison; no parole, no license, no release ever' sentence for certain crimes like this. Also the relatively unknown system of privileges you can earn in prison should not apply to these types. Currently you start as a 'basic prisoner' with basic human rights under law and not much else, but you can earn several levels of 'enhanced' status (through good behaviour) which come with various perks and responsibilities. That would be totally inappropriate in a case like this IMO.