So I'm exceedingly late in posting these from my November(!) class. Some 1 and 2-minute drawings in charcoal:
Some 5 minute poses in charcoal:
I think these are getting into the 10 to 20-minute range:
Fairly happy with the last two in terms of the shading and getting some nice depth (in some areas) if not quite anatomical correctness. I think if I would have had an hour on these, they might have been pretty good.