I just sanding some of Novella's head aggressively for about 35 minutes. It went much faster when I stopped sanding in circles and started sanding in straight lines. Yes, I am aware that I am breaking the Fourth Commandment of BJD Ownership ["Thou shalt not sand thy doll with back-and-forth motions, but only with tiny, circular strokes"], but I don't care.  I'm going a lot faster this way and seeing much more gratifying results. :p