I set out to tie 100 dozen Catskill flies last winter to try to get the proportions just right and see just how efficient I could get at it. I made it to 80 dozen. My dries got a LOT better in the process, was able to tie decent 28's, and learned a lot of time-saving moves. It was a worthwhile thing to do, even if I still have 79 of those dozen sitting in a box, waiting to be donated.