The most hopeful part of your post was "6 months or longer"
I am a believer in long term...my son did numerous 28 day programs in addition to multiple out-patient programs...
he was a chronic relapser...
sometimes he'd manage to stay clean weeks (once months) but mostly he relapsed within days of release....
he overdosed and needed paramedics to revive him...
now my AS is my RAS he lives in a christian recovery house....has been there (and clean) for 11 months...
during that time there have been triggers (mentally and physically) that might have led to relapse if he was outside...he is still learning the tools he'll need to live life drug free
don't despair over the words "long term"....they may be the words that save your son's life
prior to this facility I despaired over the insurance words..."treatment denied"
treatment offers hope...
you and your son are in my prayers