Usually, the good time in state prison is 15%, however, in state cases, there might be the possibility of parole. If the judge allows for parole in their Judgment and Commitment document then the offender might be looking at their first parole hearing in about 32 months. If no parole is offered, 85% of 96 months is about 82 months.

It means that they have already served 10 days of a 45-day sentence.

it's not the State it's the Judge deciding on the penalty. First-time DUI, no injuries or property damage, our best guess would be probation and maybe some sort of education about drinking and driving.

You can be held up to two years in most county jails, but once the offender has been convicted, they serve the bulk of their sentence in state. The time spent in county is deducted from the total sentence.

Why would they have a court date later than the release date, makes no sense? There must be some pending charge that is unrelated to the current charge.

It is possible that they have a pending sentence in State that runs consecutively to the bid they are finishing up. Depending on their Judgement and Commitment document signed by the judge, their might be more time to be served 

8 1/2 years unless they have the option of parole in their Sentencing Memorandum

You can estimate that they will serve 85% of their sentence. If you want a more definite date, contact the Clerk of the Court where they were sentenced.

Reception & Diagnostic Center (RDC) is where an inmate is first processed for their sentence in state prison. The intake process includes full medical, psychological, educational, and vocational examinations. This could take a couple of weeks to several months depending on the inmate, their sentence length, previous criminal history, current behavior, and bed space at their designated location where they will be housed for the balance of their sentence.

73 days