What is the difference between a sober living facility and an extended rehab facility?

When a person leaves a 30 day alcohol rehab facility and is faced with many options, what do they do? Obviously 30 days is not enough for a very successful recovery so extended treatment is often neccessary. There is sober living houses and there are 90 day treatment programs that follw the initial 30 day treatment. What is the main difference between the two?

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