A3 721 then SM 652 at Athens
Lisbon → Athens → Cairo
Timetable, Athens time
18:00A3 721 from Lisbon at the gate
12:00SM 652 to Cairo leaves the gate
18 h apart on the timetable, overnight
SM 652 leaves 18 h after A3 721 arrives on the timetable: more than half a day, so not a connection we count.