EC 7638 then LG 3754 at Lisbon
Nantes → Lisbon → Luxembourg
Timetable, Lisbon time
22:45EC 7638 from Nantes at the gate
18:55LG 3754 to Luxembourg leaves the gate
20 h 10 apart on the timetable, overnight
LG 3754 leaves 20 h 10 after EC 7638 arrives on the timetable: more than half a day, so not a connection we count.