The different substance abuse rehab services which are available to alcohol and drug addicted persons in Paris can differ in a lot of various ways. Some substance abuse rehab services are offered in a residential or inpatient setting, where individuals remain the entire time they are in rehabilitation which offers a more conducive rehabilitation setting. Others provide substance abuse rehabilitation services on an outpatient basis which allows for more versatility, though outpatient programs may not be a suitable substance abuse rehabilitation service for individuals in Paris who are having difficulties with long term drug or alcohol addiction issues. Whether or not inpatient or outpatient alcohol and drug abuse treatment programs are chosen, there are also different amounts of time that individuals will be required to stay in the alcohol and drug rehab center. For example, many short-term programs offer programs for 30 days or less, whereas long-term programs will require at least a 90 day stay.