How long does it take to cook a six pound rib roast?
Bone in Cook for 25 minutes a pound. A 6 lb roast takes about 2.5 hours for a rare roast, but watch the thermometer reading. After you cook it for 25 minutes a pound, take it out of the oven, let it sit for 1 minute and then check the thermometer reading. Adjust time add 15 minutes for medium rare.
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