Every primary care doctor I know that's still practicing over the age of 65 works much longer hours than I do. They're not doing night shifts, but they still take call at night and then are in clinic all day the next day. Primary care does not scale as easily as EM. If your patients cannot get in to see you, they switch doctors. And it can take years to build up a patient base. Now I guess with they way the future of healthcare is headed, you could be the doctor who signs the charts for a group of midlevels (likely NP's). Kind of like the anaesthesia/CRNA relationship. Or more accurately, the surgeon/CRNA relationship.