QR 3641 then EC 8064 at Barcelona
Catania → Barcelona → London Gatwick
Timetable, Barcelona time
20:55QR 3641 from Catania at the gate
13:30EC 8064 to London Gatwick leaves the gate
16 h 35 apart on the timetable, overnight
EC 8064 leaves 16 h 35 after QR 3641 arrives on the timetable: more than half a day, so not a connection we count.