A3 629 then A3 994 at Athens
Luxembourg → Athens → Istanbul
Timetable, Athens time
22:05A3 629 from Luxembourg at the gate
18:30A3 994 to Istanbul leaves the gate
20 h 25 apart on the timetable, overnight
A3 994 leaves 20 h 25 after A3 629 arrives on the timetable: more than half a day, so not a connection we count.