GQ 321 then GQ 840 at Athens
Limnos → Athens → Vienna
Timetable, Athens time
14:00GQ 321 from Limnos at the gate
11:40GQ 840 to Vienna leaves the gate
21 h 40 apart on the timetable, overnight
GQ 840 leaves 21 h 40 after GQ 321 arrives on the timetable: more than half a day, so not a connection we count.