You're not really supposed to "get through" the course. If all you're focused on is the end, you won't see what's on the road.

It´s hard to say. The complete course consists of 364 lessons an you´re supossed to do 1 lesson each week. Theorically, it will take you around six years to finish the course and finishing it doesn´t means you learn everything. Anatomy takes a long time to study, but don´t worry, learning just some of anatomy can make a big difference in your drawings. Also, I recommmend investing some time practicing the figure drawings fundamentals before learning anatomy.