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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.
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.