GQ 21 then A3 314 at Athens
Syros → Athens → Heraklion
Timetable, Athens time
14:00GQ 21 from Syros at the gate
13:25A3 314 to Heraklion leaves the gate
23 h 25 apart on the timetable, overnight
A3 314 leaves 23 h 25 after GQ 21 arrives on the timetable: more than half a day, so not a connection we count.