VS 156 then BA 410 at Heathrow
Las Vegas → London → Valencia
Timetable, London time
16:15VS 156 from Las Vegas at the gate
15:00BA 410 to Valencia leaves the gate
22 h 45 apart on the timetable, overnight
BA 410 leaves 22 h 45 after VS 156 arrives on the timetable: more than half a day, so not a connection we count.