A3 629 then IB 834 at Athens
Luxembourg → Athens → Madrid
Timetable, Athens time
22:05A3 629 from Luxembourg at the gate
15:50IB 834 to Madrid leaves the gate
17 h 45 apart on the timetable, overnight
IB 834 leaves 17 h 45 after A3 629 arrives on the timetable: more than half a day, so not a connection we count.