Back of the coaster calculations...
Daily to Hong Kong - about 1.5 aeroplanes
Daily to Beijing - about 2-2.2 ish aeroplanes
Those numbers will vary if the flights are ex Sydney depending on the schedule as the curfew could drive longer turnarounds in the destination ports which would mean more aircraft (or percentage of an aeroplane).
So round it up and call it 4 machines to do the daily flights approved by the IASC. Current fleet of A330's = 6. The rounding up might account for any additional ground time due to curfew constraints in Sydney.
If they operate to/from a 24 hr airport like BNE or Mel then the turnaround times can be optimised to suit the commercial situation, rather than being driven by the curfew.