I am very new the the world of BBQ. I am going to be attemping my second smoke ever. Last time i did a 9# butt and it disappeared very quickly once i got it to the dinner table. This time i would like to do two 9-10# butts. Does the 1.5 hour per pound rule apply to the total weight (20# = 30 hours of cook time) or does it apply per butt (10# each to so 15 hours of cook time.) I know you can't rush good BBQ, but i want to know what time i need to get the butts on so that we can eat at a decent time. Thanks for the help!!!!