If the hair dryer is taking too long, put it in a ziploc bag and drop it in boiling water for a minute.
Usually doesn't take any longer than that.
What I do is use the microwave to get water boiling in a pyrex measuring cup, and put the bezel in as soon as it comes out of the microwave.
If a stubborn bezel ring isn't easily removed on the first try(almost always is-almost), I'll get the water boiling again, drop the ziploc bag with the bezel in, and just leave it while the water cools for ten minutes or so. After sitting in the hot water for a bit, the bezel ring will come out with very little effort.
btw, I use latex gloves, plus a hot pan holder for holding the bezel while removing the ring. It will be hot to handle for a little while.