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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.
Put the roast directly onto the oven rack once the oven has finished heating. Place a tray beneath the roast to catch the drippings. The fat side of the roast must face upward so that the flavor of the meat drips down as the roast is cooking. Let the roast cook for 20 minutes or until browned. Lower the heat of the oven to 200 degrees (conventional ovens would use 225 degrees). Cook for an hour and a half, then check the temperature of the middle of the roast. It should be at 135 to 140 degrees.