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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
1 Mix together rest of ingredients and rub over roast. 2  Let set for one half hour. 3  Preheat oven to 325Â°, place roast in pan and place on upper oven rack. 4  Cook for 25 minutes per lb for medium or approximately 50 to 60 minutes.