BA 630 then GQ 670 at Athens
London Heathrow → Athens → Istanbul
Timetable, Athens time
13:25BA 630 from London Heathrow at the gate
07:00GQ 670 to Istanbul leaves the gate
17 h 35 apart on the timetable, overnight
GQ 670 leaves 17 h 35 after BA 630 arrives on the timetable: more than half a day, so not a connection we count.