I wouldn't be expecting 18 days off on an average all. The average is 12 off every 28. Very short Fos so they will be working harder and harder over the next 18 months. Syd base has more day trips then any other base and is by easily the hardest to commute from. I do not know one person who does it that says it is easy or enjoyable. On average those commuting spend at least $10k a year in commute travel cost etc. Plus any new commands will for certainly be SYd and PER etc. BNE commands wouldn't happen for any new pilot joining now for 10 years or more at min.