I'd be amazed if you can get two 12 pound turkeys in the #2, the 14 pound bird I just did took up well over half of my available capacity.
That said it took ~5.5hrs for my 14 pound bird to hit 165 in the breast and maybe another half hour for it to hit 170 in the breast and crest 160 in the thighs. Due to how cold it is outside it took about an hour to ramp up to 250 though, so you may want to consider initial outside temp in your planning.