When I make mine since it is in such a large batch I use all 3 racks in the oven and it takes around 3 or 4 days running 24 hours a day when I make it. I do put foil under the element but it still makes a mess and all I have to do is use the self cleaning option on the oven.
I cant wait until I build my smoke house on my farm when we move in permanently later this year. Talk about having fun this fall and early winter comes time to start slaughtering!!!
Billy