I really like assembly line quilting, and it would bother me to only to a dozen completely at a time. I like having 100 or so exactly the same seam. Even when I was doing the 365 block challenge, I'd cut and lay out 10-15 blocks and do them assembly line even though each one was different.
one of my major UFO's is a crazy quilt, and I just hate that I pretty much have to work on a block at a time. I keep trying to figure out how I can do ten together.