Time Difference Between London and Sydney

This is a nine-hour gap that behaves like a much larger one, because it falls the wrong way across both working days. Sydney is finishing as London starts. At 9 hours, 8 AM in London is 5 PM in Sydney, which leaves an hour or two in London's early morning against Sydney's late afternoon. Everything outside that is dead. Sydney's morning is London's night, and London's afternoon is the small hours in Sydney. Teams that work this corridor well tend to stop scheduling live meetings altogether and hand work over instead. London writes at the end of its day, Sydney picks it up at the start of its own, and the two sides speak once a week.

Both ends move their clocks in opposite seasons, so the difference cycles through 9, 10 and 11 hours. It is 11 hours from the last Sunday of October until the last Sunday of March, when Sydney is on daylight saving and London is not, and 9 hours from the first Sunday of April until the first Sunday of October, when that flips. The two 10-hour bridges sit between those switches: the last Sunday of March until the first Sunday of April, then the first Sunday of October until the last Sunday of October. Eleven hours is the setting to watch, because it drags the shared window earlier still. At 11 hours a 7 AM start in London is 6 PM in Sydney, about the last moment anyone will pick up.

Sydney is roughly as far from London as it is possible to get, and the trip shows it. One stop in Singapore or the Gulf is the normal routing and comes close to a full day of travel; the Qantas nonstop from Perth to London is about 17 hours by itself, which is a long time to sit still even by the standards of this route. A shift of 9 to 11 hours is about the maximum a body can be asked to absorb, and settling into it takes most people the better part of a week. On a trip shorter than that you will not adjust at all, and the usual approach is to stay on London hours and accept being awake at strange times.