QR 3522 then U2 2324 at Barcelona
Málaga → Barcelona → London Luton
Timetable, Barcelona time
00:55QR 3522 from Málaga at the gate
20:55U2 2324 to London Luton leaves the gate
20 h apart on the timetable
U2 2324 leaves 20 h after QR 3522 arrives on the timetable: more than half a day, so not a connection we count.