BA 198 then BA 352 at Heathrow
Mumbai → London → Nice
Timetable, London time
18:20BA 198 from Mumbai at the gate
18:05BA 352 to Nice leaves the gate
23 h 45 apart on the timetable, overnight
BA 352 leaves 23 h 45 after BA 198 arrives on the timetable: more than half a day, so not a connection we count.