You're correct on the clear, treat it just as if you were applying another color coat, so within one hour or the time specified.

And to speed up drying/hardening times, I just did a little dupli-color matching/ partial respray myself this weekend on a frame. I use a quartz ceramic space heater about 6-12 inches from the frame for about 20 minutes. I'll still probably wait a week before I do anything, but if you don't force-dry, a month wait is best.