That is totally up to the parole board. He should be going up for review. You can consult with an attorney about putting together a plan for release.
The information provided is not advice but a legal perspective and you should schedule a consultation with the lawyer of your choice.
I'm assuming he was sentenced to 30 years and the "minimum of 15" simply refers to parole eligibility for a 3g offense. Unless the entire thing is undone (though a pardon or a habeas action...both of which are very much uphill battles), then the current law requires him to serve at least 15 years before the parole board can exercise its discretion to release him.
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It is up to the parole board and the Department of Corrections time comp for earned time and good time credits.
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