CAO 48.0 Para 1.3 states:
The holder of a pilot licence other than a private pilot licence who engages in aerial work, charter, or regular public transport operations, shall be subject to the flight and duty time limitations specified by CASA in section 48.1 of this Part. Calculations of flight and duty time limitations made under the provisions of section 48.1 shall take into account any flight and duty time performed in the course of private operations.
So if you hold CPL/ATPL and conduct private operations then you must count this time as flight and duty.