The different alcohol and drug abuse treatment services which are available to drug addicted persons in Oakland can vary in many different ways. Quite a few substance abuse rehabilitation programs are conducted in a residential or inpatient setting, where clientele reside the entire time they are in treatment which offers a more therapeutic treatment setting. Others offer substance abuse rehabilitation programs on an outpatient basis which allows for more versatility, although outpatient centers may not be a suitable substance abuse rehab program for people in Oakland who are struggling with long term addiction problems. Regardless of whether inpatient or outpatient substance abuse rehab programs are chosen, there are also different lengths of time that people will be asked to continue to be in the drug rehabilitation facility. For example, some short-term programs provide programs for 30 days or less, while long-term centers will require at least a 90 day stay.