I had no kiln for a while and used annealing bubbles in a hot crock pot with pretty large beginner beads. I have never had one crack.
I batch annealed them all when my kiln came and had no problems.
My kiln is now a paragon bluebird, the wide one. I could torch and garage now,
but I still just build up finished beads in the crock pot and batch anneal when
I have a good many finished.
No need to stop for the day because of lack of space
