What do you consider "long"? One day for Australian PCC seems almost unbelievable. I've had to request 3 Australian PCC over the last few years. Longest one took 2,5 weeks (but that one was requested through WA police). The last one was through the federal police website (which is the one needed for EE), and that took just one week.
Were you just traveling in Australia? Did you give multiple residential addresses on the application?