RatsoreA,
I have done the Nullabor both ways a number of times in a Chieftain, BK-Albany-BK and CNK-JT return.
I was young, foolish and under self-imposed pressure to generate revenue/kick goals, although it was technically a private op.
It was about 10 hours flying and 14 hours duty westbound and 8 hours flying/12 hours duty eastbound.