Best overlap: 5:00 PM to 6:00 PM in Brisbane is 8:00 AM to 9:00 AM in Prague.
5:00 PM to 6:00 PM in Brisbane is when Prague is also working, at 8:00 AM to 9:00 AM their time. Just 1 hour of shared hours means there's little margin — set 5:00 PM in Brisbane (8:00 AM in Prague) and start promptly. The window above shifts seasonally: Prague keeps daylight saving while Brisbane ignores it.
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. -