Istanbul is 6.5 hours behind Adelaide

Best overlap: 2:30 PM to 6:30 PM in Adelaide is 8:00 AM to 12:00 PM in Istanbul.

For a call that suits both sides, look at 2:30 PM to 6:30 PM in Adelaide / 8:00 AM to 12:00 PM in Istanbul. Around 4 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day. Because Adelaide and Istanbul don't both observe daylight saving, plan to re-check the overlap around March and November.