FR 3952 then FR 1791 at Lisbon
Manchester → Lisbon → Luxembourg
Timetable, Lisbon time
20:55FR 3952 from Manchester at the gate
16:20FR 1791 to Luxembourg leaves the gate
19 h 25 apart on the timetable, overnight
FR 1791 leaves 19 h 25 after FR 3952 arrives on the timetable: more than half a day, so not a connection we count.