Miramar Treatment â 866.382.5442 The typical length of a standard alcohol and drug rehab treatment program is a common question. On average, inpatient addiction treatment time periods range from 30 to 90 days, depending on several considerations, which include the severity of the addiction, the existence of attendant psychiatric issues, financial ability, family and occupational obligations, among others. http://www.miramarlagunabeach.com