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I did a 24 hour butt brine but I put too much rub on...it came out a little salty, but very moist the crowd loved it. I've started injecting butts. It's easier and you get very moist meat. However, I brine pork chops every time. For thick chops, about 2 hours. Medium thick, about 1 1/2 hours. They turn out great. I also brine chickens, about 7 hours. Not neccesary, but it does moisten the chicken up.
Never brine a butt. It will taste like ham. However, inject it before cooking.