Victor Davis Hanson has lived at least three lives: one as a small-town grape farmer from Selma, California who discovered that it was almost impossible to make a living running a human-sized farm (1980-1984), one as a classics professor who taught large classes and published some very important but flawed work (1985-2004), and one as what Americans politely call a pundit or political commentator (beginning around 2001). At some point he retired from his position at California State University, Fresno, to focus on his third life. However, his biographies online have been scrubbed as clean as the ones which Robert A. Heinlein used to let them print in the back of his books, and they very carefully do not say when he retired. California State University Fresno has the usual gushing lists of honours, publications, and awards; Wikipedia is as useless as you would expect; and the pages from his talks and fellowships usually draw on them.
Back in 2004, Rone Tempest at the Los Angeles Times published a piece on him which gives the key dates. He was hire to launch the classics program in 1985 and retired with emeritus status (so he has library privileges, probably a pension, and maybe an office) in the summer of 2004 after only 20 years of teaching. That seems to be the year that he launched his weekly columns in several papers. He received an advance of $500,000 for A War Like No Other around 2003.