My dentist works 9-5 four days a week and likely draws a salary greater than most full time physicians. So I say no, very very few physicians are going to be in that ballpark. In medicine, if you are working 50 hours a were, you are in a lifestyle field. And that's after many grueling years of training where you probably work 70+. honestly you don't want to go into medicine if lifestyle is a high priority. It's a career of long hours populated by workaholics. And I agree with a prior poster that you must must must pick a specialty based on what you enjoy, or you will be miserable, because even if the hours are lower, spending 50 hours a week at a job you hate is a prison sentence.
But as a prior poster suggested, all this is meaningless. You haven't even gotten to premed yet. And a lot will change in medicine even before you apply.