I think it's "Paint Your Dragon".
The plot point is that the stolen time is being sold on the black market, and there's a point in the book where Bianca (the sculptress (sp?)) is given some "time" to accelerate her healing up from some sort of injury...
I'll dig that one out first and take a look.
FOR THE WIN
Paint Your Dragon, pages 22-27 (in the Orbit paperback, 1997). And later on pages 69-73 the time extraction technique of a coach load of old ladies is foiled by the coachload of demons on the Works Outing to Nashville being nearby.
Uncle Nick....THANK YOU THANK YOU THANK YOU!!!!
Now I just gotta find my copy of that book...
I have Paint Your Dragon in the "to be read" pile I may skip forward to it