U2 8123 then EC 7693 at Lisbon
London Gatwick → Lisbon → Barcelona
Timetable, Lisbon time
17:00U2 8123 from London Gatwick at the gate
11:55EC 7693 to Barcelona leaves the gate
18 h 55 apart on the timetable, overnight
EC 7693 leaves 18 h 55 after U2 8123 arrives on the timetable: more than half a day, so not a connection we count.