Final Thoughts
For an American planning a trip to Australia, the most important number to remember is often:
Three months at a time for eligible ETA holders.
But that is not necessarily the longest an American can legally remain in Australia.
Depending on your circumstances and the visa you receive, a Visitor visa may allow a stay of up to 12 months.
The key is to understanding that Australia does not have one universal stay limit for every American traveler.
Your permitted stay depends on the type of Australian visa or travel authority you hold.
And before booking a long trip, check your exact visa conditions and confirm that your planned activities match the permission you are applying for.
For further information as regards to this, check this, see this link 👇
Visitor visa (subclass 600) → official Visitor visa page.