Zurich is 7.5 hours behind Adelaide
Best overlap: 3:30 PM to 6:30 PM in Adelaide is 8:00 AM to 11:00 AM in Zurich.
3:30 PM to 6:30 PM in Adelaide is when Zurich is also working, at 8:00 AM to 11:00 AM their time. You've got a decent 3-hour window. Set a recurring time near 3:30 PM in Adelaide (8:00 AM in Zurich) and stick to it.