Re: Voyager's "Medical Staff"
It takes 4 years beyond a bachelors to earn a PH.D.
That's close to 8 years total.(It probably takes way longer when you consider you have to learn the biology of every alien species in the crew, not just human. Then what medications they can & can't take and why. So it's more like 10 to 12 yrs now)
By the time the EMH had trained anybody that far, they'd be home.
Besides beyond Janeway, B'Elanna, Kes & Seven, nobody else on the ship was smart enough to earn a PH.D any faster.
But they didn't know that they would get home in 7 years instead of 70 years.
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.