VS 156 then BA 746 at Heathrow
Las Vegas → London → Geneva
Timetable, London time
16:15VS 156 from Las Vegas at the gate
10:30BA 746 to Geneva leaves the gate
18 h 15 apart on the timetable, overnight
BA 746 leaves 18 h 15 after VS 156 arrives on the timetable: more than half a day, so not a connection we count.