I’m not a physician; I have a PhD in biostatistics. But I teach future physicians and married a physician.
It is not realistic today for most physicians to work part time, at least in the US. The first problem is that medical school tuition is outrageously high and increasing every year; my wife will be paying off her medical school debts with her social security checks. The second problem is that residency training requires 80 hour weeks even in the relatively less abusive residency programs, even longer in others. The third is that malpractice insurance rates are the same no matter how few or many patients you see, for example, a neurosurgeon practicing in the Bronx has to pay $267,000 annually for malpractice insurance before seeing his first patient. The fourth is that if medical schools and residency programs get wind of the fact that frum Jews plan to have part time careers in large numbers, that will be the end of frum Jews getting into medical school as there are far more qualified people wanting to get into medical school in the US than there are spaces available.
People should not think of medicine as a career alternative unless they are completely dedicated to the lifestyle. But what a lifestyle! You get to perform mitzvot every day of your professional life!!! No wonder Jews have been always been attracted to it.
My wife is a rare physician who has been able to work out what is basically a 40 hour a week schedule with her employer. We are very happy about that.