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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 vary according to the weight of the roast, with larger cuts of beef taking longer to cook. A 9- to 11-pound frozen roast takes about 7.5 hours to cook to well-done. Cooking times also change according to doneness as well. The same size cut of beef takes about six hours and 45 minutes to cook to a medium-rare state.