I am somewhat intrigued by the "hoping for each aircraft to fly four legs per day" comment. Where are they planning to operate to, maybe only Perth?
On another note, I recall EastWestLoco detailing some sort of a record turnaround of an F28 at Devonport, but would agree that whilst occasional miracles can be performed (particularly in small ports when there is only one aircraft to handle), it certainly won't happen in SYD, MEL, BNE or other busy airports.