If I am understanding the facts here, your fiance was just sentenced to 365 days but he has at least 90 days of credits because he did the prison diagnostic. The answer is, it depends. No more than an additional 90 days, however, he may get what we term the "kick" referring to early release based upon jail conditions - often overcrowding. The kick changes daily, but you should be advised that because the charge involved violence, it may mean smaller kick. I do not know how many credits he has, so this is just an estimate. good luck.