Many of my classes were also non-anthropology classes, too. The Ph.D. varies even more widely. It also depends very much on the nature of your research project. Again, data collection is not something that can be rushed. It is important not to rush.
Timing is more important than time.
It tells you if MA and Ph.D.'s are offered, how many student majors, graduate students, etc. are enrolled, how many graduated in the most recent year, what funding may be available, who the profs are and what their specializations are, etc. Write to professors with whom you think you may want to study. Arrange to meet with them, in person, to visit the campus and town. It's worth the investment. You should check with the departments to which you are applying and talk with the graduate coordinator who can offer you some more specific advice.