BA 349 then TP 1359 at Heathrow
Nice → London → Lisbon
Timetable, London time
21:05BA 349 from Nice at the gate
13:40TP 1359 to Lisbon leaves the gate
16 h 35 apart on the timetable, overnight
TP 1359 leaves 16 h 35 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.