BA 1499 then BA 534 at Heathrow
Glasgow → London → Napoli
Timetable, London time
09:50BA 1499 from Glasgow at the gate
09:00BA 534 to Napoli leaves the gate
23 h 10 apart on the timetable, overnight
BA 534 leaves 23 h 10 after BA 1499 arrives on the timetable: more than half a day, so not a connection we count.