RO 273 then SM 652 at Athens
Bucharest → Athens → Cairo
Timetable, Athens time
18:30RO 273 from Bucharest at the gate
18:00SM 652 to Cairo leaves the gate
23 h 30 apart on the timetable, overnight
SM 652 leaves 23 h 30 after RO 273 arrives on the timetable: more than half a day, so not a connection we count.