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There's no absolutely correct answer to your question as the cooking time will have a lot to do with the size of your smoker and the actual pork shoulders themselves. A good guideline though is about 1.5-2 hours/pound at 225 degrees. Check out this link for all the information you could possibly want, the rest of this guys site is pretty great too. http://www.amazingribs...
Multiple regular-sized cakes > a big one.
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