Welcome to the lifetime hobby/sport.
The licence is only a licence to learn and there are no shortcuts whether you learning in the US or in Oz.
It is competency based, some people achieve PPL after minimum legally required 40hours, majority after 60hours, some after 100+hours. That depends on how often you fly, how prepared you are for the lesson (theory, armchair/mental flying), your age, how keen you are, etc... A lesson per week is about an average, which brings you in range of ~60hrs.
You could theoretically fly 8 hours per day and achieve minimum 40 hours within a week, however learning is like a sponge. It can take limited amount of water (knowledge) no matter how much water you soak it in.
Also training for a licence, in my opinion should be a year long, to experience all weather seasons, winds, because it is better to experience surprises with instructor than without..
The process goes:
- get your ARN
- get medical
- study and pass ppl theory
- go flying
and the best shortcut is if you do it in this order since the theory is an obstacle which many people postpone until the very last moment.
Training in the US will cost you significantly more $ than in Oz when you take into account other costs such as airline tickets, house/car rentals, cost of living, etc.. and I am yet to hear about an examiner (cfi, chief pilot) who would risk his/her career by signing off anyone not ready/competent for a licence.
Prepare for the lifetime journey and enjoy it!