First time smoking Prime Rib, and I can't really find a solid "planning number", so I can guesstimate a time for my in-laws to come over for dinner. I'm planning on running my smoker at 250, and pulling between 120-125 internal. Roughly how many min/lb should I plan for? 30-ish? It's bone-in, but not tomahawk (Whole Foods had them on sale, so win for me).