If the sentence is 7 years, how much actual 'inside' time will he do?
As the sentence is over four years, there is no automatic right to parole at the halfway point, and he will have to go up before the parole board. As his crime is non-violent, and he won't ever get the chance to reoffend, he will almost certainly get parole at the first attempt. So if he gets seven years, he will be out in about four.