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I wouls say if they are about 3/4 or 1" thick. I would think about an hour to hour and a half. I would take them to maybe 145-150 or so but we like a little pink to ours.
For your temps, I would say 1.5 - 2 hrs. Planning on doing the same thing tomorrow with four monster chops. We cut our's like T-Bone's, ~ the same size as you described and that has been the cook time at 250. I like mine well done though.