FR 689 then GQ 921 at Madrid
Vienna → Madrid → Athens
Timetable, Madrid time
17:05FR 689 from Vienna at the gate
14:20GQ 921 to Athens leaves the gate
21 h 15 apart on the timetable, overnight
GQ 921 leaves 21 h 15 after FR 689 arrives on the timetable: more than half a day, so not a connection we count.