How long to become a doctor in Australia?

It depends a little

First you need to go through a medical course (5 or 6 years undergraduate, 4 years postgraduate)

You then need to work as an intern

You then need to be accepted for training in a specialist college - in this case the Royal Australian and New Zealand College of Radiologists (can take a few years, it's competitive in all the specialties)

Then you train as a radiologist. 5 years.

So all up, inleast 12. Long time. But then what in life is easy?