BA 923 then TP 1367 at Heathrow
Hannover → London → Lisbon
Timetable, London time
13:10BA 923 from Hannover at the gate
12:25TP 1367 to Lisbon leaves the gate
23 h 15 apart on the timetable, overnight
TP 1367 leaves 23 h 15 after BA 923 arrives on the timetable: more than half a day, so not a connection we count.