My longest is happening right now.. I have had 4 butts totaling 26 pounds on my WSM since 5am. I am in the 175 - 180 range on all of them right now and anticipate another couple hours. Weather has been good and cooperative, have not had to add water, but did add about 20 briquettes about 3 hours ago as my fuel was getting a bit low. I have had 2 neighbors stop by to see what I was 'queing because of the smell...that is such a cool feeling, it may also have helped since it was near dinner time.