One month is thought about "short-term rehab," and anything longer is considered "long-lasting rehabilitation." The only difference between rehab lengths is that treatment is more intensive in short-term rehab because more therapy is being condensed into a much shorter time period. Unlike inpatient rehab, when you select an outpatient program, each action of the rehab process is usually completed at a different center.As soon as that's finished, the real treatment can begin 90 days is usually a minimum, but lots of people continue seeing a counselor or attending group therapy for several years. The longer you invest in rehab, the more expensive it will be. Nevertheless, those who have serious dependencies might not get all the aid that they require in short-term rehabilitation.