I don't think there is a set "amount of treatment" that will get him sober. It all depends on how bad he wants it. There are many people who have used nothing but AA to get sober. For that matter, there are many who have gotten sober without any formal "treatment" to speak of.
Instead of keeping tabs on how much treatment he is getting, I would suggest you watch his actions. If he truly wants to get sober, he will, and it will be apparent.
L