BA 266 then BA 660 at Heathrow
Portland (Oregon) → London → Larnaca
Timetable, London time
11:20BA 266 from Portland (Oregon) at the gate
10:55BA 660 to Larnaca leaves the gate
23 h 35 apart on the timetable, overnight
BA 660 leaves 23 h 35 after BA 266 arrives on the timetable: more than half a day, so not a connection we count.