BA 349 then BA 990 at Heathrow
Nice → London → Berlin
Timetable, London time
21:05BA 349 from Nice at the gate
16:55BA 990 to Berlin leaves the gate
19 h 50 apart on the timetable, overnight
BA 990 leaves 19 h 50 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.