Best overlap: 1:00 PM to 6:00 PM in Perth is 8:00 AM to 1:00 PM in Nairobi.
For the smoothest call, aim inside 1:00 PM to 6:00 PM in Perth, i.e. 8:00 AM to 1:00 PM in Nairobi. Since Nairobi is 5 hours behind Perth, the workdays overlap by around 5 hours; 1:00 PM in Perth (8:00 AM in Nairobi) makes a reliable recurring slot.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Perth Australia/Perth | ||||||||||||||||||||||||
Nairobi Africa/Nairobi |
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. -