Will my boyfriend do the whole two years in prison?

My boyfriend was on probation for burglary an habitation an did a six months program an six years probation on deferred . he violated his probation for small minor things an got it revoked he got a two year sentence prison time but already has owe back time in the county 11 months . when he goes to prison will he have to do the whole two years or no cause he already has owe back time an when will he make parole if possible.