BA 198 then BA 750 at Heathrow
Mumbai → London → Geneva
Timetable, London time
18:20BA 198 from Mumbai at the gate
17:35BA 750 to Geneva leaves the gate
23 h 15 apart on the timetable, overnight
BA 750 leaves 23 h 15 after BA 198 arrives on the timetable: more than half a day, so not a connection we count.