OPEN MINDS, The Behavioral Health & Social Service Industry Analyst Industry Statistics The average inpatient length of stay at private specialty psychiatric hospitals and general hospital behavioral health programs fell by three percent between 2003 and 2004, from 9.8 days to 9.4. Of the programs surveyed in 2003 and 2004, including child, adolescent, adult, older adult, adult alcohol and drug abuse, youth alcohol and drug abuse, older adults averaged the longest length of stay with 13.7 days in 2003, and 13.2 days in 2004. The . . .