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.
Time off is usually only used for rest as people regularly work shifts of 11 to 13 hours. Working hours are so long that people sleep in the factories when a new product is being released. Additionally, if targets are not met, lunch breaks are also cancelled.