Here's another figure drawing. I can't remember how long it took to draw it, but NONE of the poses are ever longer than eight minutes, and it's been a while since I've drawn an eight minute sketch. So, I'm going to guess it's between eight minutes or seven. Again, there' s not a whole lot of time to work things out, just enough time to practice your proportions and design skills.
This isn't my class, but when I was teaching up in Utah, I typically liked to start with ten three minute sketches, then go to four fives...and then two tens. Having been properly warmed up, the students were now ready to draw. The longest pose my student's would draw would be 20 minutes. This is enough time to do a little rendering, but not enough rendering to hide weakness in their drawings.
Drawing and rendering are not the same thing! Go ahead and post what you think the differences are between the two.