CX 255 then BA 750 at Heathrow
Hong Kong → London → Geneva
Timetable, London time
06:50CX 255 from Hong Kong at the gate
19:30BA 750 to Geneva leaves the gate
12 h 40 apart on the timetable
BA 750 leaves 12 h 40 after CX 255 arrives on the timetable: more than half a day, so not a connection we count.