Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
The elapsed time taken to earn a Ph.D. in economics is analyzed with data from 618 1996-97 Ph.D.s. A duration model indicates that students supported by fellowships, and those holding a prior Master's degree finish faster. Americans, those who take jobs before completing their degree, and those with children take longer. Kids slow the progress of women, but not men. The only difference among fields is more time required for industrial organization and international economics. There is no difference in time-to-degree between men and women, married and single students, older and younger students, and those enrolled in larger or smaller Ph.D. programs.