Prime rib questions

[testar77]

It's been a while since I have done one. I am doing a very large (around 24 lbs) prime rib for a large family that has a family member in ICU so I need to have time line somewhat accurate. I figure I should cut it in half and do it in two pieces, but what would be a good average time per pound at 220? I remember last time I did one it finished way faster than I planned. Want to take to 130-135° then it can rest on my way to the hospital.

Thanks in advance guys

 

[dirtsailor2003]

For roasts like prime rib it's more about the thickness and pit temp then the weight. You won't save anytime cutting the roast in half. If space is an issue cut it or if you need some more done as the ends will be more medium.

At 325 I usually figure 3 hours cook time plus whatever rest time. This would be for a bone on PR. Boneless will be about the same.

 

[stickyfingers]

About that.

 

[beefmeister]

I just did an 8 lb bone-in @ 225. Took ~4 hours to 118 internal.

And I would cut it in half.

Our well worn Doubleday Cookbook says at 300, figure 18 to 22 minutes per pound for rare (125) and brought to room temp before cooking

 

[testar77]

I ended up with a 19 lb boneless. I definitely plan on cutting in half. At 225° would 40-45 min per pound sound reasonable to get to 130 ish?