I don't use a candle for annealing but instead a propane torch. I hold the case being annealed between a thumb and fore finger and rotate it through the tip of the flame. I count "thousand one, thousand two etc up to thousand 7" and then remove it. With WSM cases I usually stop at "thousand six". These are about the limits of my ability to hold onto the cases and they do show a colour change when finished.

Works for me, YMMV.

Jim