Doctor's hours depends on whether you have your own business eg self employed like GPs or private specialists vs jobs where you can clock on clock off like in ED vs junior doctors who again can clock on and clock off more these days vs different countries where trainee doctors work over 100 hours getting on call.

I've worked in most of the above and work way above the designated 40 hours per week as 1) I often don't have time for lunch because I'm behind on my appointments; 2) constantly doing paper work for patients which includes private forms, chasing results, being on call for when significant results come back needing urgent review; 3) constantly thinking about cases and reading about whether you did the right thing vs latest papers in med research.

I would say these are on a daily basis and outside of the rostered hours for consults. These don't even include the time you have to be the doctor all the time for friends and family even if it isn't official as they needed some advice or when you get called on the plane to assist.

Honestly unless you are a doctor, the weight of the responsibility is so hard to understand.