The math works out more favorably than the full two years suggest, and here is how to read it.
The starting point is 85 percent of the 24-month sentence, which is the standard minimum time served requirement in California and several other states for most offenses. Eighty-five percent of 24 months equals 20.4 months as the total time that needs to be served.
From that 20.4 months, you subtract the 96 days of presentence credit he has already earned. Ninety-six days converts to roughly 3.2 months. Subtracting that from the 20.4 month total leaves approximately 17.2 months of remaining time to serve from the point of sentencing.
So the practical answer is that if everything stays on track, he is looking at just over 17 months remaining rather than the full two years the sentence implies. That is a meaningful difference and the credit he built up before sentencing is doing real work in that calculation.
What can move that number in either direction is his conduct going forward. The 85 percent floor is protected as long as he keeps a clean disciplinary record. Infractions that result in loss of good time credits push the release date further out. Staying out of trouble is the single most direct way he controls how much of those remaining 17 months actually get served.
His case manager at the facility can run the exact calculation using the official good time credit formula and give you a specific projected release date based on the current record.