FR 1307 then FR 5054 at Madrid
Napoli → Madrid → Luxembourg
Timetable, Madrid time
12:55FR 1307 from Napoli at the gate
06:50FR 5054 to Luxembourg leaves the gate
17 h 55 apart on the timetable, overnight
FR 5054 leaves 17 h 55 after FR 1307 arrives on the timetable: more than half a day, so not a connection we count.