Every jurisdiction will be different, but West Virginia has largely retained the old system that has been removed in the federal system.
Largely our sentences are indeterminate, meaning that the range specified in the statute is what you get. For example, the sentence for burglary is an indeterminate 1 to 15 years in prison. When you are being sentenced, that is exactly what the judge gives you: a 1 to 15. He doesn’t pick 3, 5, 7, 11, or 15; the sentence is 1 to 15.
In that case, you must do one year before you see the parole board. You can be released then if the parole board believes it is proper. If not, you wait a full year before seeing the parole board again.
In addition, we have “day for day” good time credits on the maximum or “back end” of the sentence. That means that so long as you get good time credits, you will discharge your sentence (meaning you walk out the door with no more supervision) after 7 and 1/2 years even if you never make parole and so long as your get all of your good time.
A minority of the statutes have determinate sentencing. For example First Degree Arson carries a determinate sentence of 2 to 20 years. Since it is determinate, the judge actually picks a number. He picks 2, 5, 10, 15, 17, or 20. Let’s say the judge picks 20. In any determinate sentence, you are eligible for parole after serving 1/4 of your sentence and you get the same day for day good time credit.
So, if it is 20 years, you are eligible for parole in 1/4th of the time, or 5 years, and you discharge your sentence if you get all of your good time in 10 years. Some crimes specify a minimum term before parole eligibility, such as the First Degree Arson mentioned. It says you must serve at least three years before being eligible for parole.
So let’s say that the judge gives you 4 years. That means that with your good time, you will discharge in two and never see the parole board. But that is a unique statute.