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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.
Time to put it in the oven. Put the lid on, then roast in a 275-degree oven for 3 hours, for a 3 pound roast. For a 4 to 5 pound roast, plan on 4 hours. And donât peek and fiddle and frig with it, either. Just find a hobby that will occupy your thoughts and actions for the time it takes for your roast to cook.ime to put it in the oven. Put the lid on, then roast in a 275-degree oven for 3 hours, for a 3 pound roast. For a 4 to 5 pound roast, plan on 4 hours. And donât peek and fiddle and frig with it, either. Just find a hobby that will occupy your thoughts and actions for the time it takes for your roast to cook.