One month is considered "short-term rehab," and anything longer is thought about "long-term rehabilitation." The only distinction between rehab lengths is that treatment is more extensive in short-term rehab because more treatment is being condensed into a much shorter duration of time. Unlike inpatient rehabilitation, when you select an outpatient program, each step of the rehabilitation procedure is typically completed at a separate center.Once that's finished, the actual therapy can start 90 days is generally a minimum, but lots of people continue seeing a therapist or participating in group treatment for multiple years. The longer you invest in rehabilitation, the more expensive it will be. Nevertheless, those who have severe dependencies may not receive all the help that they need in short-term rehab.