FR 3073 then FR 3108 at Barcelona
Prague → Barcelona → Luxembourg
Timetable, Barcelona time
11:15FR 3073 from Prague at the gate
06:15FR 3108 to Luxembourg leaves the gate
19 h apart on the timetable, overnight
FR 3108 leaves 19 h after FR 3073 arrives on the timetable: more than half a day, so not a connection we count.