BA 935 then VS 155 at Heathrow
Düsseldorf → London → Las Vegas
Timetable, London time
18:00BA 935 from Düsseldorf at the gate
17:40VS 155 to Las Vegas leaves the gate
23 h 40 apart on the timetable, overnight
VS 155 leaves 23 h 40 after BA 935 arrives on the timetable: more than half a day, so not a connection we count.