IB 5403 then EW 7521 at Barcelona
London Gatwick → Barcelona → Hamburg
Timetable, Barcelona time
16:05IB 5403 from London Gatwick at the gatealso LL 5403, VY 7607
10:10EW 7521 to Hamburg leaves the gate
18 h 05 apart on the timetable, overnight
EW 7521 leaves 18 h 05 after IB 5403 arrives on the timetable: more than half a day, so not a connection we count.