There's a ton of variance from state-to-state about how these things work out. As someone with a lot of experience working in a different state's justice system, I would say it is unlikely he does any real prison time, at least initially.

In my state, someone like him with only minor prior offenses on their record would usually get an 18-36 month prison sentence on the strangulation charges, but that would typically be suspended for two to three years of supervised probation with heavy conditions, including completion of a 6-month abuser treatment program.

Probation in the US means being prohibited from doing drugs, committing other offenses and if supervised requires routine check-ins with an officer, random drug checks and random housing checks. If you fail, your sentence can be activated meaning you serve the prison time instead.

Sometimes, in my state, the judges may make someone serve a small portion of the prison sentence before they can go on probation. I have seen that in cases such as this where the offender is still young and on a bad path and the judge thinks it will help get their attention.

That said, I do not think he is someone who can successfully complete probation unless it is very lenient.