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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.
Roasting times for Beef. Preheat your oven to 160Â°C (325Â°F) and use these cooking times to prepare a roast that's moist, tender and delicious.Your roast should be covered with foil for the first half of the roasting time.8 to 10lb Joint 2Â½ to 3 hours The Beef can be taken out sooner if you prefer rare (bloody) meat.Tips for a better roast.ow long does it take to cook a 15 lb beef roast at 250 degrees in a barbecue pit? Internal temp = 130Â°F to 140Â°F (55Â°C to 60Â°C) for medium rare. About 15-20 min/lb at 275 - 300 degrees Fahrenheit.