for non-violent offenses, with good behavior you typically only serve 30-40% of your sentence (at least in iowa, my wife is a social worker and deals with people in the system).
He was convicted in federal court, and in the federal system there's no parole and only very limited credit for good behavior. He'll serve at least 87.1% of his sentence[1] (barring unlikely events such as a successful SCOTUS appeal or a pardon). Most likely he'll die in prison -- old prisoners age quite quickly.
