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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.
How long do you cook a 2lb pork roast in a crock pot? When cooking a 2lb roast, it can be cooked for 3-4 hours on the low  setting.A 2lb roast can also be cooked on high for 7-8 hours.r put a pork roast, 3 medium carrots peeled and cut into chunks, 1 onion quartered, 3 celery stalks rinsed and cut into crock pot with 1 cup water, salt pepper to taste. Cook on low and slow for about 6-8 hours.