Yeah, my initial reaction was that was a long time, but when I thought about it I wasn't so sure. They were a mirror image in size and shape, total weight between 16-17 lbs, about an inch separation, at 225. That works out to about 2 hrs a lb. I do think the next time I do multiple butts I will set at 235, maybe 240.
In any case, the results were very good.