http://www.immi.gov.au/students/visa-conditions-family.htm 8104
Mandatory where visa granted on or after 26 April 2008 You cannot work more than 20 hours a week*
Note: You must not start work until the primary student visa holder has commenced their course.
Exceptions: Family members of the following students can work unlimited hours once the primary student visa holder has commenced their course:
Students studying a masters by coursework degree (subclass 573)
Students studying a masters by research degree or doctorate (subclass 574)
Students sponsored by AusAID or Defence and studying a masters by coursework degree, masters by research degree or doctorate (subclass 576).
*A week begins on a Monday and ends on the following Sunday.