Going to and completing a residential long-term rehab (more than 30 days) program in Zahl is usually the cornerstone in an addict's successful recovery from their individual struggles with drug or alcohol addiction. This form of drug treatment is much more intensive than others mainly because the individual lives at the facility full-time through the treatment process. While many addicts are initially hesitant about going to a long-term program lasting longer than 30 days they soon understand the wonderful benefit. A residential long-term treatment (more than 30 days) program supplies the recovering person the time to completely withdrawal from drugs and concentrate on themselves. Shorter programs are not capable of this due to their short duration.