VS 156 then BA 990 at Heathrow
Las Vegas → London → Berlin
Timetable, London time
16:15VS 156 from Las Vegas at the gate
16:00BA 990 to Berlin leaves the gate
23 h 45 apart on the timetable, overnight
BA 990 leaves 23 h 45 after VS 156 arrives on the timetable: more than half a day, so not a connection we count.