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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.
Step 5. Place the pot roast and any vegetables in a roasting pan or slow cooker. Sprinkle the meat with salt and pepper. Pour your âpot roast brewâ on top. Cook your 3- or 4-pound pot roast at 300 degrees Fahrenheit for about 3 hours after covering the roasting pan with foil.tep 5. Place the pot roast and any vegetables in a roasting pan or slow cooker. Sprinkle the meat with salt and pepper. Pour your âpot roast brewâ on top. Cook your 3- or 4-pound pot roast at 300 degrees Fahrenheit for about 3 hours after covering the roasting pan with foil.