Can I politely suggest that this argument re 6 six sectors days etc is a waste of everyone's time until T & C's like daily/monthly duty hour limitations, provisions for extension of duty time by mutual agreeement/disruption etc, sign on & off time etc are known and shared with everyone?
I recall reading somewhere a suggestion that there was going to be a daily limit of 14 hours. Whether or not this is fact I don't know - but I can tell you now, you can quite easily fit in a 6 sector MEL-SYD duty in 14 hours - including an hour sign on, 1/2 hour turnarounds, and 45 min sign off. Until the facts are known and shared, there is quite simply no point debating it.
And also don't forget, whats on the schedule now isnt necessarily what will be on the schedule in 6 or 12 months time...