I have actually taken the trip from Minneapolis - LA-Sydney-Launceston and then because we wanted to stay on the East coast of Tasmania - a 3 hour drive to Binalong Bay.
We left at 4:50 pm, December 21st, arived in Sydney at 8 am on the 23rd, and after a day at the beach flew to Launceston in the evening, and arrived in a rainstorm unable to find the key to the house we rented. We got in our house at around 10:30 pm.
I have no idea how long the trip took, but I would definitely do it again. Driving through rural Tasmania feels like you are alone in a truly exotic location.
Interestingly enough, I think Barnbougle should be more of a "must" destination for Australians than Americans or Europeans.
For us, there are many links options far more accessible, with the sandbelt courses being the truly once in a lifetime type experience. I viewed Barnbougle as on par with, but not all that much different than Scotland or Ireland.
For Australians, Barnbougle is the one opportunity of which I am aware to experience a links course that feels just like Ireland and Scotland without travelling 1/2 way around the world. Even the weather is right.