Okay...I've got a 14lb. six bone prime rib in the fridge for tomorrrow. I'll take it out of the fridge 2 hrs. before cooking. I intended to "sear" it in a 450* oven for 10-15 mins., then turn the heat down to 275* for the remainder of the cook time.
I've read 20 mins./lb. That almost 5 hrs. Could that possibly be correct? We like it rare-med. rare. I have a thermometer, but I'd like some idea of when it will be done so I can plan when we eat.
Any help at this late hour would be great.