BA 611 then BA 928 at Heathrow
Palermo → London → Hannover
Timetable, London time
15:10BA 611 from Palermo at the gate
14:50BA 928 to Hannover leaves the gate
23 h 40 apart on the timetable, overnight
BA 928 leaves 23 h 40 after BA 611 arrives on the timetable: more than half a day, so not a connection we count.