A3 621 then SM 652 at Athens
Brussels → Athens → Cairo
Timetable, Athens time
15:25A3 621 from Brussels at the gate
12:00SM 652 to Cairo leaves the gate
20 h 35 apart on the timetable, overnight
SM 652 leaves 20 h 35 after A3 621 arrives on the timetable: more than half a day, so not a connection we count.