Estimating Cooking Time for Large Beef Roasts. If you roast at a steady 325F (160C), subtract 2 minutes or so per pound. If the roast is refrigerated just before going into the oven, add 2 or 3 minutes per pound. WARNING NOTES: Remember, the rib roast will continue to cook as it sets.
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How long do I cook pork shoulder for? While several factors affect the cooking time of a pork shoulder, cooks should roast a 6-pound shoulder blade roast at 325 degrees Fahrenheit for 25 to 30 minutes per pound or 2 1/2 to 3 hours. Cook pork to a minimum internal temperature of 145 degrees Fahrenheit.
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1 Do not cover or add water.  Place the roast in the preheated oven. Reduce the temperature to 475 degrees F (245 degrees C). Roast for 21 minutes (seven minutes per pound) then turn off the oven and let the roast sit in the hot oven for 2 1/2 hours. Do not open the door at all during this time!
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Pork roasts generally take approximately 20 minutes per pound when they are roasted at 325 degrees Fahrenheit. Browning the roast on the stove top, and roasting it at 375 F reduces the cooking time to approximately 50 to 65 minutes, no matter its size.
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1 This usually takes no more than 1/2 to 1 hour additional if the roasts are close to the same size.  As you remove each roast from the oven, tent it with aluminum foil; let it rest at least 15, up to 60 minutes to redistribute juices and finish cooking.
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If it's roast beef and you want it medium rare in the middle and cooked on the ends then put the oven up to 400 degrees for 20 - 30 minutes and then put it down to 330 - 350 (basting every 15 minutes in it's own juices. It would 15 - 20 minutes per pound. Frozen beef roasts cook faster so cook 12 - 15 minutes per pound. You can use a thermometer to test it or, cut into the middle of the roast a little to see if it's the way you want it. DO NOT RUB SALT ON YOUR ROAST as it toughens the meat.
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1 Preheat the oven at least 1/2 hour, especially if doing more than one roast. Place rack in the lowest position so the the middle of the roast will be in the middle of the oven.  Remove roasts from refrigerator 1/2 to 2 hours before cooking.
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1 Remove roasts from refrigerator 1/2 to 2 hours before cooking.  Trim most fat from beef roasts, leaving an even layer over the top to self-baste while cooking; season. If you are a garlic family, stab all over with a thin knife and slide in bits of garlic to taste.
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1 Roast for 21 minutes (seven minutes per pound) then turn off the oven and let the roast sit in the hot oven for 2 1/2 hours. Do not open the door at all during this time!  Remove the roast from the oven, the internal temperature should have reached at least 145 degrees F (65 degrees C). Carve into thin slices to serve.
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Conventional oven; 325F. Convection oven: 275F. Roast in preheated oven 8 to 23 minutes per pound (see table below) or until internal temperature of the smallest roast reaches 125F to 155F. Remove from pan at desired temperature.
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cooking hours per pound roast
It takes seven minute to roast per pound.