A3 323 then GQ 670 at Athens
Heraklion → Athens → Istanbul
Timetable, Athens time
18:00A3 323 from Heraklion at the gate
06:55GQ 670 to Istanbul leaves the gate
12 h 55 apart on the timetable, overnight
GQ 670 leaves 12 h 55 after A3 323 arrives on the timetable: more than half a day, so not a connection we count.