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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.4  If you were cooking a 5 pound roast, you would cook the meat for 110 minutes.stimate the time it will take your roast to cook. Generally, roasting time can be estimated by how many pounds of meat you will be cooking. The length of time you cook your roast for will depend on whether you want your meat rare, medium rare, or medium.
3. Heat the oven to 500 degrees for a raw roast, 375 for a pre-browned one. 4. Place the roasting pan in the oven; cook for 10 minutes, then lower the heat to 300 degrees. 5. Cook for about 45 minutes, then start checking the roast's temperature with an instant-read thermometer.Remove the roast when the internal temperature, measured as deep into the roast as you can get, reads 165 degrees. 6.t what temperature and for how long per pound do you cook a pork roast? My co-worker wants her daughter(13) to put the roast in the oven for her before she gets home, but she did't know at what temp and for how long to tell her to leave it in. She said it is a small 2 lb pork roast.