BA 679 then ET 701 at Heathrow
Istanbul → London → Addis Ababa
Timetable, London time
22:35BA 679 from Istanbul at the gate
20:15ET 701 to Addis Ababa leaves the gate
21 h 40 apart on the timetable, overnight
ET 701 leaves 21 h 40 after BA 679 arrives on the timetable: more than half a day, so not a connection we count.