I think we are so far east in the time zone here in south east Queensland it would make sense to be in a different time zone all year. Civil Twilight sunrise is at 4:30am in summer, sunset twilight finishes at 7:15pm. Even in mid winter civil twilight starts at 6am and sunset twilight finishes at 5:30pm. A half hour shift would work for me all year, not just in summer. However people here adapt, there are A LOT of people at the beach before work at 5am in summer and still a fair few in winter.