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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.
(Cooking times will vary â the following times are determined from a 3.5 pound roast!). 1  For medium-rare meat the roast should take about 50-55 minutes. 2  A medium roast will take approximately 1 hour exactly. 3  A well done roast will take about 1 hour and 10-15 minutes. It should reach 150 degrees F for a medium-rare roast, 160 degrees F for a medium roast, and 175 degrees F for a rare roast. 2  Cooking temperatures vary depending on the weight of your roast.