The Denver post is getting a little bit better with understanding Colorado's sentencing in sex assault cases. Still not great.

 The guy will be eligible for parole after 9 years in prison (probably fremont correctional where they send sex offenders). In order to actually be paroled, he has to complete sex offender treatment while in prison. There is a huge backlog for even getting in to start the classes, so right off the bat the chances of him paroling at 9 years are low. 

On top of that, in order to complete treatment, he will have to acknowledge that he is guilty and take responsibility for his actions (and probably his prior actions, the Hawaii high school thing will probably come back up). Sounds like he's not ready to do that, so treatment's not going to go well. He very well could spend the rest of his life in prison. 

Even if he does parole, he will be on lifetime supervision, any violations, he goes back to prison.