ET 764 then GQ 840 at Athens
Addis Ababa → Athens → Vienna
Timetable, Athens time
13:35ET 764 from Addis Ababa at the gate
08:30GQ 840 to Vienna leaves the gate
18 h 55 apart on the timetable, overnight
GQ 840 leaves 18 h 55 after ET 764 arrives on the timetable: more than half a day, so not a connection we count.