You have people that have gone through the ringer to become doctors. These are the type of people that when you say jump, they ask how high. You can pretty much get them to do anything you want... because they are self-selected to be that sort of people otherwise they could have never become doctors. So when a manager comes to them and tells them they have to work so and so hours, they do it. And they suck it up, because that's who they are.