How long does it transport until someone properly become a chief nurse anesthetist?

I was sort of browsing around medical professions, and I decided to take a closer look at the aforementioned craft. However, as I was reading multiple sources, it was ambiguous as to how many years it take until someone can finally stop attending college to become a chief nurse anesthetist. I know it takes at least a master's degree, but after that I can't really enlighten. To me it looks like 6-8 years, but I am not sure. Does anyone know how long it takes?
Answers:
Nurse anesthetist- 6 years.
Chief- depends on hospital.
GOOD LUCK.

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