FR 5055 then FR 572 at Madrid
Luxembourg → Madrid → Porto
Timetable, Madrid time
18:35FR 5055 from Luxembourg at the gate
16:40FR 572 to Porto leaves the gate
22 h 05 apart on the timetable, overnight
FR 572 leaves 22 h 05 after FR 5055 arrives on the timetable: more than half a day, so not a connection we count.