The pan doesn't glow, but to get a feel for now long it would take with your setup, fill it full of 22LR jackets that need to be annealed. After 15 minutes take one out, drop it in water to quench it, then see if you can pinch it in your fingers. If you can do this, then you are good to go.
When I bond my core and anneal at the same time, I give the pot a few extra minutes as your now heating the extra lead as well. I fill the whole bottom with one even layer. In my Dutch oven, which isn't that big, I can get a couple hundred 9mm cases and about 150 40's.
The best way would be like Grumpa does it, is to get a skillet with a lid. More surface area, less height to heat.
Sunday I did over 700 core bonded 9mm cases in about an hour and a half. Just make to let the lead cool enough before dumping the brass on the concrete. You only make that mistake once......