BA 905 then IB 722 at Heathrow
Frankfurt am Main → London → Madrid
Timetable, London time
18:55BA 905 from Frankfurt am Main at the gate
18:45IB 722 to Madrid leaves the gate
23 h 50 apart on the timetable, overnight
IB 722 leaves 23 h 50 after BA 905 arrives on the timetable: more than half a day, so not a connection we count.