IB 719 then BA 746 at Heathrow
Madrid → London → Geneva
Timetable, London time
16:35IB 719 from Madrid at the gate
10:30BA 746 to Geneva leaves the gate
17 h 55 apart on the timetable, overnight
BA 746 leaves 17 h 55 after IB 719 arrives on the timetable: more than half a day, so not a connection we count.