TK 624 then BA 679 at Istanbul
Abuja → Istanbul → London Heathrow
Timetable, Istanbul time
06:05TK 624 from Abuja at the gate
18:35BA 679 to London Heathrow leaves the gate
12 h 30 apart on the timetable
BA 679 leaves 12 h 30 after TK 624 arrives on the timetable: more than half a day, so not a connection we count.