IB 719 then BA 928 at Heathrow
Madrid → London → Hannover
Timetable, London time
16:35IB 719 from Madrid at the gate
16:05BA 928 to Hannover leaves the gate
23 h 30 apart on the timetable, overnight
BA 928 leaves 23 h 30 after IB 719 arrives on the timetable: more than half a day, so not a connection we count.