Melbourne: 9 days (near chinatown, the G, The Espy) Sydney: 9 days (Circle Quay, Barangaroo, Blue Mountains) Cairns, Airlie Beach, Yeppoon, Hervey Bay, Brisbane (2-3 days each).

I'm American, my card doesn't do contactless, nor chip and pin. I also used old straight swipe cards while there for fun.

I used cards for most purchases except at the melbourne market and a few other places where cash was required.