how. long to cook a  top of roast in the oven
A boneless beef cut like a top round roast typically takes 30 to 35 minutes per pound to reach the USDA-recommended temperature of 145 degrees Fahrenheit when roasted at 350 F, a total of 120 to 140 minutes. To cook it to medium-rare, or 135 F, subtract about 7 minutes per pound, for an estimated cooking time of a little over 1 1/2 hours. To cook the top round to medium-well, or 155 F, add about 7 minutes per pound to the medium estimate, for an approximate cooking time of a bit more than 2.5 hours.