Melbourne is 17 hours ahead of Vancouver
Best overlap: 3:00 PM to 6:00 PM in Vancouver is 8:00 AM to 11:00 AM in Melbourne.
The hours that work for both Vancouver and Melbourne are 3:00 PM to 6:00 PM (Vancouver) and 8:00 AM to 11:00 AM (Melbourne). The shared window is roughly 3 hours; treat its midpoint as the default and you'll keep both teams happy. Worth a glance at the calendar — Melbourne is on the next day, so align on the date as well as the time.