Independence is a condition of a nation, country, or state in which its residents and population, or some portion thereof, exercise self-government, and usually sovereignty, over the territory. The opposite of independence is the status of a dependent territory.
Depending on the state. If it's a four year federal sentence you will have to do 85% ,or they takeoff 54 days a year for good behavior. Most states abdopted the NERA Act for federal funding (No Early Release Act). Meaning if you're incarcerated for a violent crime you will be required to do 85% of your sentence.
Good conduct time. Good conduct time, good time credit, or time off for good behavior is a sentence reduction given to prisoners who maintain good behavior while imprisoned. Good time can be forfeited if a prisoner is determined to have committed disciplinary infractions and/or crimes while incarcerated.