Where you been Man.....we done spent 13 pages on'is20-serve-15 means the MAXIMUM possible time of incarceration is 15 years, followed by 5 more on probation.
Probation = freedom with supervision. Monthly visits with probation officer, occasional drug screens, etc.
But, out of those 15 years of prison, the general rule is that a person is eligible for parole after serving 1/3 of his or her sentence. So for 15 years of incarceration time given, it could be as little as 5 or 6 to actually serve.
Plus 2-for-1 credit for any time served at the local jail, from the date of arrest until that person either bonded out or was convicted and sentenced.