Giving the ending of ‘Better Call Saul’ realistically, would he…

We all know Jimmy (Saul) is being bars for 86 years. He jokes “who knows, with good behavior..” implying he could get out sooner.

I’m no lawyer not am I familiar with sentencing times. Realistically, will he remain in prison the rest of his life? Or could it actually be possible to get out sooner?