The various alcohol and drug abuse rehab programs which are available to alcohol and drug addicted individuals in California can vary in many various ways. Quite a few substance abuse rehabilitation programs are offered in a residential or inpatient facility, where clientele remain the entire time they are in rehab which supplies a more therapeutic treatment environment. Others provide substance abuse rehabilitation programs on an outpatient basis which allows for more versatility, though outpatient programs are not always an appropriate substance abuse treatment program for individuals in CA. who are struggling with long term drug addiction difficulties. Whether or not inpatient or outpatient substance abuse rehabilitation services are chosen, there are varying amounts of time that people will be asked to remain in the drug treatment program. For instance, some short-term programs offer programs for 30 days or less, whereas long-term programs will require at least a 90 day stay.