One month is considered "short-term rehab," and anything longer is considered "long-lasting rehab." The only difference between rehab lengths is that treatment is more intensive in short-term rehabilitation considering that more therapy is being condensed into a shorter amount of time. Unlike inpatient rehabilitation, when you go with an outpatient program, each step of the rehabilitation procedure is usually completed at a separate facility.As soon as that's completed, the real therapy can begin 90 days is normally a minimum, however many individuals continue seeing a counselor or participating in group therapy for multiple years. The longer you invest in rehabilitation, the more expensive it will be. However, those who have severe addictions may not get all the help that they need in short-term rehabilitation.