BA 339 then BA 438 at Heathrow
Nice → London → Amsterdam
Timetable, London time
12:15BA 339 from Nice at the gate
11:50BA 438 to Amsterdam leaves the gate
23 h 35 apart on the timetable, overnight
BA 438 leaves 23 h 35 after BA 339 arrives on the timetable: more than half a day, so not a connection we count.