He will most like do the entire year since this a violation from a previous "early release" that he didnt recognize as a gift.
https://www.inmateaid.com/ask-the-inmate/my-boyfriend-had-2yrs-left-on-paper-he-violate-and-got-arrested-the-judge-gave-him-1-year-in-state-prison-will-he-have-to-do-the-whole-year-or-can-he-get-out-early-on-goof-behavior#answer
Accepted Answer Date Created: June 21,2018