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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.
Preheat the oven to 500 degrees Fahrenheit, and wait patiently because it will take several minutes to get that hot. 3. Roast the pork shoulder at a high temp first. Once the oven is up to temperature, put the roast in the middle of the oven. For this ten-pound roast, I let it roast at 500 degrees for 40 minutes. For smaller roasts, 20 to 30 minutes should be long enough. This first stage helps to form the tasty crust on the outside of the roast.