BA 493 then BA 724 at Heathrow
Gibraltar → London → Zurich
Timetable, London time
20:45BA 493 from Gibraltar at the gate
19:10BA 724 to Zurich leaves the gate
22 h 25 apart on the timetable, overnight
BA 724 leaves 22 h 25 after BA 493 arrives on the timetable: more than half a day, so not a connection we count.