IB 712 then EC 4796 at Madrid
London Heathrow → Madrid → Nantes
Timetable, Madrid time
12:50IB 712 from London Heathrow at the gatealso VY 5412, BA 7053, QR 8012
12:45EC 4796 to Nantes leaves the gate
23 h 55 apart on the timetable, overnight
EC 4796 leaves 23 h 55 after IB 712 arrives on the timetable: more than half a day, so not a connection we count.