The workday of a substitute teacher is fixed at 6 hours and 50 minutes, inclusive of lunch, every day (Monday through Friday), regardless of a school's professional development or parent engagement schedule. Substitutes may not leave before they have completed a full 6 hours and 50 minute workday, even if students have been dismissed.
During the extra 30 minutes when students are not in attendance, the DOE's expectation is that you will attend 30 minutes of the professional development sessions, or on non-PD days, spend the time leaving an account for the teacher you covered, planning for the following day, reflecting on the day, returning and organizing class materials, reviewing records for accuracy, meeting with colleagues to obtain feedback, or carrying out other instructional/classroom administrative tasks which might be assigned.