Taipei is 1.5 hours behind Adelaide
Best overlap: 9:30 AM to 6:30 PM in Adelaide is 8:00 AM to 5:00 PM in Taipei.
Shoot for 9:30 AM to 6:30 PM in Adelaide; your Taipei colleagues will see that as 8:00 AM to 5:00 PM. That's a roomy 9 hours of common time each day, so finding a slot that suits everyone is rarely a problem. Daylight saving complicates things slightly: Adelaide observes it, Taipei doesn't, so the difference flexes by an hour part of the year.