So you've not read about the Dr who had ended up working for almost 3 days straight, due to being on call, with so little sleep he ended up talking to a hallucination in the corridor?
Just remember, these "tried" Dr's are in charge of peoples LIVES, not a check out in a supermarket, etc.
But remember, its not like he's working on a building site where he can just drop sticks at the end of his shift which is why a lot of the time their 45 hour week goes out to 60. There's also then the after care and handovers that need to be done and they are sometimes also on call.
Oh! and the...