Prime Rib Question

I did one a few nights ago. It weighed about 5 pounds. I cooked indirect the whole time starting at 500 for 20 minutes and then 350 for the rest. I pulled it off when internal temp was 130. That took about another 50-55 minutes after the initial 20 minutes. I covered with foil and poked a meat thermometer through the foil and waited until the internal temp rose to 140. That took another 15 minutes of resting. It was a perfect medium rare.

So, the whole process took about 90 minutes once the roast went on the BGE. Oh, it was freakin awesome.