The different alcohol and drug abuse rehab programs which are accessible to drug addicted individuals in Portola Valley, California can vary in several different ways. Some substance abuse treatment services take place in a residential or inpatient facility, where clients reside for the duration of their rehabilitation which offers a more conducive rehab setting. Others provide drug and alcohol abuse rehabilitation services on an outpatient basis which provides a sense of flexibility, although outpatient facilities are not always an appropriate drug and alcohol abuse rehabilitation program for people in Portola Valley who are having difficulties with serious addiction difficulties. Whether inpatient or outpatient substance abuse rehab programs are chosen, there are also different lengths of time that individuals will be required to continue to be in the alcohol and drug rehabilitation facility. For instance, many short-term programs provide programs for 4 weeks or less, whereas long-term facilities will require at least a 90 day stay.