To what extent do mainline Protestant seminaries in the United States involve rigorous study of Hebrew and Greek? What is the minimum course load in learning these languages? How rigorous are such courses? How many elective courses tend to be offered, and how frequently are these chosen by current students?

By mainline Protestant seminaries, I mean the seminaries of the sort that are associated with Ivy League universities (eg Princeton Theological Seminary, Union Seminary) or those affiliated with mainline denominations (eg Pittsburgh Theological Seminary, associated with the PCUSA).