Best overlap: 8:00 AM to 1:00 PM in Islamabad is 1:00 PM to 6:00 PM in Brisbane.
Islamabad and Brisbane overlap from 8:00 AM to 1:00 PM (Islamabad) to the equivalent 1:00 PM to 6:00 PM in Brisbane — that's your meeting window. The overlap sits at about 5 hours; aim for the heart of it so the call isn't too early for one team or too late for the other.
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. -