 ...of the Biden dropout and the endorsement of Kamala Harris. Paul in Bayside, New York City. It is my understanding that when a vice president assumes the presidency, if he or she serves more than six months in that office, they can run for higher election only once for four years. If they serve less than the six months in that capacity, they can run twice and serve eight years. Oddly enough, Biden stepped down 179 days before Inauguration Day.