LX 345 then U2 6842 at Zurich
London Heathrow → Zurich → Porto
Timetable, Zurich time
08:40LX 345 from London Heathrow at the gate
21:40U2 6842 to Porto leaves the gate
13 h apart on the timetable
U2 6842 leaves 13 h after LX 345 arrives on the timetable: more than half a day, so not a connection we count.