How long do midwife nurse have to go to school for?

I'm changing my major to nursing. I thought of become either an obstetrician or a gynecologist, but doesn't those two require a doctorate degree. I do not think I can handle that, I just want to be able to get my bachelor and master degree. I am planning to become a midwife nurse. How long do midwife nurse have to go to school for? I tried to looked up the information as to how long obstetrician, gynecologist, and midwife nurse have to school for, but is having a hard time. I tried talking to people the nursing department at school, but they told me to deal with my prerequisite cles and getting into the program.