I think pretty much the same way as lil, long term is usually much better than 28 days. 28 days for any type of recovery is just getting started, hopefully this will be the thing he needs to kick his habit. It will go by faster than you even realize. He'll be in a place where he has to take care of himself and deal with his issues.
Your at a great place also, keep posting there are some wonderul people here who will help you along the way.