The six generations of high priests covered a little more than two centuries (538-333 B.C.), or a little under thirty-five years to a generation. Jaddua was the high priest who (according to Josephus) had an interview with Alexander shortly after the battle of Issus.
Related Commentaries of Nehemiah 12:10
Nehemiah 12:10-11
10 And Jeshua begat Joiakim, Joiakim also begat Eliashib, and Eliashib begat Joiada,
11 And Joiada begat Jonathan, and Jonathan begat Jaddua.