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Apr 09,  · Cook: 5 hrs. Total: 21 hrs. Servings: 4 to 8 servings. ratings. This recipe only requires four ingredients but provides a deliciously tender standing rib roast. a bone-in or boneless rib of beef of between five and 10 pounds. For a bone-in prime rib, figure two servings per rib, while a boneless roast will yield two servings per pound.