The minimum trainee appointment time is nine months for MPH and MS trainees. The minimum trainee appointment time is twelve months for PhD trainees. Exceptions are possible–for example, when a trainee graduates mid-year. The student’s appointment period does not have to coincide with the time period of the grant. It is possible to appoint a PhD trainee for 12 months beginning in any month of the grant year as long as the appointment ends within the 5-year grant period. Only the beginning date must fall within the grant period.