It's usually 4 years, sometimes a bit more, for a B.A. in the U.S. and an additional 2 years for an M.A. A Ph.D. is sometimes a separate track from an M.A. or M.S., and requires 3 to 5 years beyond your B.A. or B.S.In the UK you get your BA usually after 3 or 4 years of study and top it up to an MA with a further one year's study.