Eric, I just cooked two butts for my in-laws and it took 23 hours to reach 195° internal. I had to bump the grid temp up from 225° to 275° for the last four hours in order to get them done. I never opened the dome once and I was using a BBQ Guru the entire time. I also had a Polder plugged in to help keep tabs on them. It certainly wasn't a shortage of lump because I still had over a third left from when I started.The only thing I did differently this time was to use my cast iron grid instead of my stainless steel grid. That shouldn't have made any difference. Maybe it was just a stubborn pig LOLSpring "Head Butt-Head" Chicken Spring Texas USA