Standard work week now is 38 hours, so a wages-only employee could find that worth using as a guide, perhaps with CAO 48 as the upper limit for overtime. If our wages-only employee chooses to do excessive overtime or night shift and goes to sleep after a 60 hour week while driving home and has a head-on with another car, under the law he IS liable. Fatigue is up there with drink driving as an offence.
If an aircraft accident occurred and fatigue was implicated, a good litigation lawyer could make mincemeat of CASA's pathetic indifference to private operations.