Tgw123 thanks again for the info. I see the actual rotation is 5/2 5/4, 52/ 5/5. That makes more sense (although is not so good) compared to what was said before of 5/2 5/4 5/5.
Regarding the leave, why do you have to be back in Singapore 2 or 3 days before flying? Is arriving the day before not enough?
Can you shed some more light on those transitions between earlies and lates? Are the changes happening within the 5 days period?
I usually fly plenty of 4 sector days a month so that wouldn't be a problem, unless they are really long 4 sectors.
When you are on lates, are all the flights on that bracket from about 7-9pm coming back 4-6am?
I hope you have the time and patience to answer.
Cheers and happy landings.