据说官方文件里讲
Two (2) academic years study means the equivalent of two (2) years study enrolled at 100% of a full time load. It is a measure of the amount of study you have completed rather than how long it took you to complete the study.
If you are given credit for prior learning it will reduce the amount of study you have completed.
The department will use the Commonwealth Register of Institutions and Courses for Overseas Students (CRICOS) to determine the standard duration of a course. A course that has a registered duration of 104 weeks is considered to be a two year course.