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QF IT has the same sort of issues - I regualrly find BNE-MEL noted as 3hr 25m and MEL-BNE noted as 1h 10min. Funny thing but the BIS timings suggest an hour less for the former and an hour more for the latter.
Emailed QF who replied rudely that they know about daylight saving....
It's an issue year in year out. Look at 581/582, 3:45 to Sydney in rocket time!