A3 629 then A3 866 at Athens
Luxembourg → Athens → Prague
Timetable, Athens time
21:55A3 629 from Luxembourg at the gate
17:15A3 866 to Prague leaves the gate
19 h 20 apart on the timetable, overnight
A3 866 leaves 19 h 20 after A3 629 arrives on the timetable: more than half a day, so not a connection we count.