How long does it take to cook a 8.5 pound prime rib?
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                            5 pounds) – 22 to 24 minutes. ribs (4 to 5 pounds) – 60 to 70 minutes.  ribs (7 to 8.5 pounds) – 1-1/2 to 1-3/4 hours.  ribs (9 to 10.5 pounds) – 1-3/4 to 2-1/4 hours.  ribs (11 to 15 pounds) – 2-1/4 to 3 hours. More items.... 
                    
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