Brisbane lads do more over nights, typically around 10 to 12 nights a month. Most trips are 3 or 4 days straight and as stated sometimes go back to back i.e 6 days straight. Stick hours vary from around 70 per month up to over 90 a month. Duty time causes the most fatigue. Particularly back of the clock and extended layovers between turn arounds. I think QF are very similar.