BA 929 then BA 784 at Heathrow
Hannover → London → Stockholm
Timetable, London time
22:35BA 929 from Hannover at the gate
19:05BA 784 to Stockholm leaves the gate
20 h 30 apart on the timetable, overnight
BA 784 leaves 20 h 30 after BA 929 arrives on the timetable: more than half a day, so not a connection we count.