Best overlap: 8:00 AM to 11:00 AM in Perth is 3:00 PM to 6:00 PM in Anchorage.
If you set up a recurring sync, 8:00 AM to 11:00 AM in Perth (3:00 PM to 6:00 PM in Anchorage) is the natural home for it. Anchorage is 17 hours behind Perth, leaving about 3 hours of daily overlap — enough for most meetings if you don't leave them too late in the day. One thing to flag — this overlap crosses the date line, so Anchorage is on the previous day relative to Perth. Keep an eye on the calendar — Anchorage observes daylight saving and Perth doesn't, which nudges this window by an hour twice a year.
The US to Australia gap runs 14 to 19 hours depending on the month, and someone is always in tomorrow. Exact overlap windows for every US coast, the double-DST trap, and a rotation rule that keeps it fair. -