I didn't keep track closely but I think I put in about twenty-five hours on this piece. During this time, I began to pick up some comfort with my pencils and their sharpening. Same for using tracing paper with a cutout--that became important due to the size of this drawing.
I am still working on scanner settings. In fact, this image was from the camera. It's a reasonable approximation of the tones except I think the whites of my drawing are a bit lighter.