Officers are another matter entirely.

Infantry officer

There is no name for this course it's just the basic officer training.
>Location of course: Royal Military College, Duntroon Canberra, ACT
>Duration of course: 18 months

>Royal Australian Infantry Regimental Officer Basic Course (ROBC)
>Duration: 11 Weeks

So about 21 months.

https://www.defencejobs.gov.au/jobs/army/infantry-officer

Artillery Officer.