U2 8446 then U2 8497 at Gatwick
Nantes → London → Geneva
Timetable, London time
11:40U2 8446 from Nantes at the gate
11:15U2 8497 to Geneva leaves the gate
23 h 35 apart on the timetable, overnight
U2 8497 leaves 23 h 35 after U2 8446 arrives on the timetable: more than half a day, so not a connection we count.