EC 7668 then EC 7693 at Lisbon
Luxembourg → Lisbon → Barcelona
Timetable, Lisbon time
13:20EC 7668 from Luxembourg at the gate
11:55EC 7693 to Barcelona leaves the gate
22 h 35 apart on the timetable, overnight
EC 7693 leaves 22 h 35 after EC 7668 arrives on the timetable: more than half a day, so not a connection we count.