I'm so glad to hear it. You know, when M was in residential at the end of the year, we were luck enough that our insurance covered it as two different years, if you know what I mean. The clock re-started in January. Not that there's much of December left... but you may get 30 days out of it.
If I had to do it again, I would be certain that my primary role was to be sure that he had supports when he was released. There are all sorts of reasons that a person drinks or acts out or whatever. But ultimately, the decision to drink or act out belongs with the person doing it, not the person they may blame (right or wrong). I can't remember if you have been the Residential Treatment Center (RTC) route before, so I apologize in advance if it seems that I am oversimplifying. I only hope that he will realize that whatever his demon is, he is the one that will have to stand up to it if he wants to conquer it.
For now, enjoy the quiet. It's a wonderful thing that he is so far away. It's much more difficult for him to think that he can just waltz out of it when the going gets tough. You guys need the respite.