Given different time zones, email is by far the best way to contact me. I will work hard to respond within 48 hours during working days.
Kindly note:
I don't work 24/7, especially at weekends or public holidays.
Please contact me as early as possible if you aim at getting quick response before these breaks start or the deadline of assignments submission.
My contact detail:
juan.liang@nmit.ac.nz