The different alcohol and drug abuse rehabilitation services which are offered to drug and alcohol addicted persons in Williamsville can vary in several different ways. Some substance abuse rehab services take place in a residential or inpatient facility, where clients remain for the duration of their treatment which supplies a more therapeutic rehab setting. Others offer alcohol and drug abuse treatment programs on an outpatient basis which provides a sense of flexibility, though outpatient facilities are not always an appropriate substance abuse treatment service for individuals in Williamsville who are having difficulties with long term drug or alcohol addiction problems. Whether or not inpatient or outpatient alcohol and drug abuse treatment programs are chosen, there are varying lengths of time that men and women will be required to continue to be in the drug and alcohol treatment program. For example, many short-term programs offer services for 30 days or less, while long-term facilities will demand at least a 3 month stay.