none. farming is common sense.
you will spend 11 years in college to become a pediatrician.
Graduation with a DEGREE from an accredited 4 year college/university.
I'm not sure what question you are asking exactly - how many clock hours, how many credit hours? In the United States to become a veterinarian you need to complete at least 7 years of college - 3 years of full-time undergraduate and 4 years of full-time vet school. From this, you can calculate the number of hours you are asking about.
You can become a magician without college
There are many college classes that are needed to become a historian. Many history classes are needed for example.
how many years in college does it take to become a diagnostic radiologist noninvasive?
1
4
There is no requirement to have any college to become a plumber.
You do not need to go to college to be a beekeeper. Many people do it as a hobby.
how many years in college does it take to become a diagnostic radiologist noninvasive?
The time required to become a massage therapist can vary. 330 to 1,000 contact hours and up to two years of program study are required in many states. These vary depending on state law.