Depravity's Tableau
Over the course of about 6 weeks, I spent probably 80-90 hours on Gravity's Rainbow, reading, looking up references and rereading. My guess is that to get to a place where you would have some sort of grasp on the story and some understanding of the themes and symbols in play would require at least another 20. Maybe twice that much. I will spend more time on it, but at the moment I am Pynchoned out and need a break.