UA 942 then EC 7667 at Lisbon
Washington → Lisbon → Luxembourg
Timetable, Lisbon time
10:20UA 942 from Washington at the gate
07:45EC 7667 to Luxembourg leaves the gate
21 h 25 apart on the timetable, overnight
EC 7667 leaves 21 h 25 after UA 942 arrives on the timetable: more than half a day, so not a connection we count.