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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.
The average cook time for a 2.5 pound roast in a crock pot is six hours; more if you are adding vegetable to it, slightly less if it will not be disturbed while cooking. Removing and replacing the lid over and over to check the meat results in a loss of heat that increases the cook time. to 3 minutes per side should do...   Place roast, ve â¦ ggies, and seasonings in crock pot... Layer veggies first (potatoes, carrots, then celery), set the roast on top. Add just enough liquid to cover the roast, set to high, then cook 9-10 hours...