MS 753 then GQ 921 at Madrid
Cairo → Madrid → Athens
Timetable, Madrid time
13:50MS 753 from Cairo at the gate
11:15GQ 921 to Athens leaves the gate
21 h 25 apart on the timetable, overnight
GQ 921 leaves 21 h 25 after MS 753 arrives on the timetable: more than half a day, so not a connection we count.