Despite not agreeing with Posner's view of the world, I remain astounded by the sheer amount of work he publishes a year. According to The Bucks Stops Here Posner wrote over 170 opinions in one year! If you think that by itself is a lot, keep in mind he published and updated four books and dozens of law review and shorter articles. Plus he has a blog. And he guest blogs and debates. And he has an extensive list of speaking arrangements.
I can't get over the total number of opinions he writes. He makes Jacob Neusner look like an amateur.