GQ 21 then GQ 2 at Athens
Syros → Athens → Kozani
Timetable, Athens time
14:00GQ 21 from Syros at the gate
10:15GQ 2 to Kozani leaves the gate
20 h 15 apart on the timetable, overnight
GQ 2 leaves 20 h 15 after GQ 21 arrives on the timetable: more than half a day, so not a connection we count.