The diverse alcohol and drug abuse rehabilitation programs which are available to drug and alcohol addicted persons in Ontario can vary in many various ways. Some substance abuse rehab services take place in a residential or inpatient setting, where clients remain for the duration of their rehab which supplies a more conducive rehabilitation setting. Others provide alcohol and drug abuse rehab services on an outpatient basis which allows for more versatility, although outpatient centers may not be an appropriate alcohol and drug abuse rehab service for people in Ontario, CA. who are having difficulties with long term drug addiction issues. Whether or not inpatient or outpatient drug and alcohol abuse rehab services are selected, there are varying lengths of time that individuals will be asked to remain in the drug and alcohol rehabilitation center. For example, some short-term programs provide programs for 4 weeks or less, whereas long-term centers will demand at least a 3 month stay.