The various substance abuse rehab programs which are offered to drug addicted persons in California can differ in many different ways. Some drug and alcohol abuse rehabilitation services take place in a residential or inpatient setting, where clientele remain for the duration of their treatment which offers a more therapeutic treatment setting. Others offer alcohol and drug abuse rehabilitation services on an outpatient basis which provides a sense of versatility, although outpatient facilities may not be a suitable drug and alcohol abuse rehabilitation program for individuals in California who are having difficulties with serious addiction issues. Whether or not inpatient or outpatient drug and alcohol abuse rehab programs are selected, there are also different amounts of time that men and women will be asked to remain in the drug treatment center. For instance, quite a few short-term programs provide programs for a month or less, while long-term facilities will require at least a 3 month stay.