[TheJackal]

I would 'guess' 10-11 hours at 225, 7.5-8.5 at 250, 5-6 at 275. This is on an insulated cooker with wrapping in foil at 6, 5, 4 hours respectively and 'done' at about 198 IT. Don't worry about them getting done early. You can hold them for a good 4-6 hours and they will still be too hot to handle. You do not have a picnic. That is a butt. The flat part of the bone is usually on the side of the butt. The round part is in the back and opposite the money muscle.