As many as it takes you to spell college right ;) just kidding. It should really depend on the persons abilities. If they can handle a heavy course load or if they need to take it at a slower pace.
It depends on where you go to school. In the USA, 4 yrs of college, 4 yrs of medical school, and 4 yrs of residency. In the UK, I believe it is 7 yrs following college, and in Australia there is a 6-yr residency after medical school, after college.
To become a ob/gyn you need to have:
4 years of college
4 years of medical school
4 years of residency
12
You only have to go 4 years
Obstetricians complete a bachelor degree including the courses required for admission to medical school. They complete four years of medical school, and then a three year residency. Further specialization may require additional fellowship training.
7 years
8+years
4 years
4 years
3
None. A college degree is not usually required for that profession.
4 years of college university 2 years of college technical training and complete high school.
None
4 years of college.
it takes 5 or more