Except for tradition, there's little logic in physicians insisting on certain office hours. Even hospital rounds can be balanced between morning and afternoon to permit balanced office usage.
What is more, doctors find work less stressful when the office is not jammed with too many physicians, too many patients, and too few exam rooms. Average out your group's schedule so nearly the same number of doctors are on hand at any given time.
Your office staff, including receptionists, technicians and nurses, will be more effective-and less hassled-while you save money on space and personnel costs.