QR 3546 then FR 7808 at Barcelona
Bilbao → Barcelona → London Luton
Timetable, Barcelona time
12:40QR 3546 from Bilbao at the gate
10:15FR 7808 to London Luton leaves the gate
21 h 35 apart on the timetable, overnight
FR 7808 leaves 21 h 35 after QR 3546 arrives on the timetable: more than half a day, so not a connection we count.