IB 720 then EC 1704 at Madrid
London Heathrow → Madrid → Nice
Timetable, Madrid time
20:50IB 720 from London Heathrow at the gatealso LA 1584, VY 5181, BA 7059, QR 8071
13:10EC 1704 to Nice leaves the gate
16 h 20 apart on the timetable, overnight
EC 1704 leaves 16 h 20 after IB 720 arrives on the timetable: more than half a day, so not a connection we count.