BA 393 then BA 928 at Heathrow
Brussels → London → Hannover
Timetable, London time
17:40BA 393 from Brussels at the gate
14:50BA 928 to Hannover leaves the gate
21 h 10 apart on the timetable, overnight
BA 928 leaves 21 h 10 after BA 393 arrives on the timetable: more than half a day, so not a connection we count.