GQ 821 then SM 652 at Athens
Rome → Athens → Cairo
Timetable, Athens time
16:00GQ 821 from Rome at the gate
12:00SM 652 to Cairo leaves the gate
20 h apart on the timetable, overnight
SM 652 leaves 20 h after GQ 821 arrives on the timetable: more than half a day, so not a connection we count.