TP 1367 then FR 1791 at Lisbon
London Heathrow → Lisbon → Luxembourg
Timetable, Lisbon time
15:15TP 1367 from London Heathrow at the gate
15:00FR 1791 to Luxembourg leaves the gate
23 h 45 apart on the timetable, overnight
FR 1791 leaves 23 h 45 after TP 1367 arrives on the timetable: more than half a day, so not a connection we count.