A3 353 then GQ 670 at Athens
Santorini → Athens → Istanbul
Timetable, Athens time
08:55A3 353 from Santorini at the gate
06:55GQ 670 to Istanbul leaves the gate
22 h apart on the timetable, overnight
GQ 670 leaves 22 h after A3 353 arrives on the timetable: more than half a day, so not a connection we count.