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1 For a medium rare roast: Cook the roast for 20 minutes for every pound. 2  If you were cooking a 5 pound roast, you would cook it for 100 minutes. 3  For a medium roast: Allow 22 minutes of cooking time for every pound.
Pork roasts should cook for about 20 minutes per pound. However, a pork shoulder may need to cook for 30 minutes per pound depending on its size. This means for a pork roast that is 5 pounds, cooking time will be around 2 1/2 hours, as opposed to the normal cooking time of 90 minutes for other cuts of pork.Bones in a roast will speed up the cooking time.A bone acts as a heat conductor which helps to cook the meat from the inside.his means for a pork roast that is 5 pounds, cooking time will be around 2 1/2 hours, as opposed to the normal cooking time of 90 minutes for other cuts of pork. Bones in a roast will speed up the cooking time. A bone acts as a heat conductor which helps to cook the meat from the inside.