I stopped working when it was clear that finishing the drawing would take rather a long time. I'd already exceeded my hour minimum, and it was time to sleep.
Day 20: Fabric, not having a canon of proportions for me to rely on, takes me forever to draw. This was a bit more than my hour.
Day 21: Close, but no cigar. I decided at the start of the hour that this would be my last day spent drawing her, since there were other things out there to work from; if I hadn't been determined to also finish a painting and a drawing that night, I would have rounded out the time spent on this session to an hour and a half. Alas.
Probably something like three, maybe three and a half hours went into my Gillian-drawing, all told. It would almost certainly be faster to use an actual methodology in my drawing, rather than picking a place to start at the top of the figure and rendering as I move down. For one thing, the proportions here are a bit suspect... though I'm very proud that I got a likeness with the face not only turned away but mostly covered.