The most I did at one time on the large was 12 racks. I put 10 the way they are in the previous picture and 2 on top. I rotated every 30 minutes to ensure even cooking. I did not foil and then stacked them in 2 groups of 6 for saucing. I would sauce the top one and rotate it to the bottom. Kept doing that at the end until all were just like I wanted them. It was a lot of work the first time, but got easier.Gene