From entry into doctoral program
From passing of candidacy exam
Time to Degree (TTD) was calculated selecting all doctoral degree recipients who earned the doctoral degree between the 1999-2000 academic year and August, 2005. Time in years was calculated by counting the number of days from the first day of the first semester in which the student’s degree was equal to “PhD” or “DEd” (as displayed in ISIS) through the date of degree conferral, and then dividing by 365.
Source: The Graduate School