GQ 347 then GQ 670 at Athens
Santorini → Athens → Istanbul
Timetable, Athens time
22:30GQ 347 from Santorini at the gate
19:15GQ 670 to Istanbul leaves the gate
20 h 45 apart on the timetable, overnight
GQ 670 leaves 20 h 45 after GQ 347 arrives on the timetable: more than half a day, so not a connection we count.