The various substance abuse rehabilitation programs which are available to alcohol and drug addicted persons in Mars can differ in several various ways. Some substance abuse rehab programs are offered in a residential or inpatient facility, where individuals remain the entire time they are in rehab which provides a more therapeutic treatment setting. Others offer substance abuse rehabilitation programs on an outpatient basis which provides a sense of flexibility, though outpatient centers are not always an appropriate substance abuse treatment service for individuals in Mars who are having difficulties with serious drug addiction problems. Regardless of whether inpatient or outpatient substance abuse rehab programs are selected, there are varying amounts of time that men and women will be asked to remain in the alcohol and drug treatment center. For example, quite a few short-term programs provide programs for a month or less, whereas long-term programs will require at least a 12 week stay.