A3 371 then GQ 670 at Athens
Mykonos → Athens → Istanbul
Timetable, Athens time
10:00A3 371 from Mykonos at the gate
06:55GQ 670 to Istanbul leaves the gate
20 h 55 apart on the timetable, overnight
GQ 670 leaves 20 h 55 after A3 371 arrives on the timetable: more than half a day, so not a connection we count.