Personally I have not found any more time needed between my 4x5 and the 8x10....they work just about the same. Now the 12x20 is another matter, and that is mainly because of the logistics of mounting the camera by myself on the tripod, not an easy thing to do. Once the camera is mounted though the process is the same as the 4x5.....and with only one lens sometimes is even faster, as I dont have the temptaion of changing lenses to see what different focal lenghts will do.