I've been taking a figure drawing class down at the Bridge Academy from Adam Ford. I've been down there once a week for 4 weeks now, only 2 of which Adam has been on hand to teach us (it's an every other kind of setup, the other weeks are studio & model time). It's really upped my game quite a bit. One of the things that Adam really stresses is speed; if you only have 5 min, get a drawing done, if you only have 20 min, get a drawing done, etc, etc. Draw, draw, draw. This only about a 3rd of what I've done down there.
30sec - 2 min