The different substance abuse treatment programs which are accessible to drug addicted persons in Portland can differ in several different ways. Quite a few drug and alcohol abuse rehab services are conducted in a residential or inpatient location, where clientele reside the entire time they are in rehabilitation which provides a more conducive rehabilitation setting. Others provide substance abuse treatment programs on an outpatient basis which allows for more flexibility, though outpatient centers may not be an appropriate drug and alcohol abuse rehab service for people in Portland who are struggling with serious addiction problems. Whether or not inpatient or outpatient drug and alcohol abuse rehabilitation services are selected, there are also different amounts of time that individuals will be asked to stay in the alcohol and drug rehab facility. For example, many short-term programs provide services for 30 days or less, while long-term programs will call for at least a 3 month stay.