LL 5423 then FR 4545 at Barcelona
London Heathrow → Barcelona → Porto
Timetable, Barcelona time
13:10LL 5423 from London Heathrow at the gate
06:45FR 4545 to Porto leaves the gate
17 h 35 apart on the timetable, overnight
FR 4545 leaves 17 h 35 after LL 5423 arrives on the timetable: more than half a day, so not a connection we count.