U2 7638 then EC 7681 at Lisbon
Nantes → Lisbon → Barcelona
Timetable, Lisbon time
22:45U2 7638 from Nantes at the gate
19:00EC 7681 to Barcelona leaves the gate
20 h 15 apart on the timetable, overnight
EC 7681 leaves 20 h 15 after U2 7638 arrives on the timetable: more than half a day, so not a connection we count.