No rehab or detox is effective for tapering benzodiazepines. You absolutely must taper very very slowly. No one could stay in rehab that long. Rehabs taper you off in 10 or so days. Don’t believe anything you read on the internet about rehab places that say they taper Benzos. It can take some people years to taper correctly depending on how long they’ve been on them and the dose they were on.