BA 923 then BA 982 at Heathrow
Hannover → London → Berlin
Timetable, London time
13:25BA 923 from Hannover at the gate
12:25BA 982 to Berlin leaves the gate
23 h apart on the timetable, overnight
BA 982 leaves 23 h after BA 923 arrives on the timetable: more than half a day, so not a connection we count.