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Mine usually takes from 8 to 10 hours. I try to keep the smoker between 225 to 250. Near 225 is better.
When the meat reach 160F I wrap in foil and spray a generous amount of unsweeten apple juice and apple cider vinegar at a ratio of 4 to 1. I remove it from the smoker when it reach 190 and let it stan for an hour before processing it.