15, same as I got for my abcess last week (except I had 2 types, 15 each). I can say with confidence, based on bitter experience, that you should not attempt to do a 600 after taking the course. Stay close to toilets. On the positive side, the toothache went after 2 or 3 days
edit... so now I'm driving up to the frozen North for Guy Fawkes Buddhist Retreat pain free.