* The subjects the student was taking: Each subject had its own exam date and time.
* The specific school: Schools had their own internal schedules leading up to the exams, including things like revision periods and study leave.
To find out the specific exam timetable for a particular subject in the 2009 HSC, you would need to find archived materials from the NSW Education Standards Authority (NESA) website (or its predecessor, the Board of Studies) from that year. Unfortunately, access to such detailed historical data might be limited.