A3 825 then GQ 670 at Athens
Hamburg → Athens → Istanbul
Timetable, Athens time
16:25A3 825 from Hamburg at the gate
07:00GQ 670 to Istanbul leaves the gate
14 h 35 apart on the timetable, overnight
GQ 670 leaves 14 h 35 after A3 825 arrives on the timetable: more than half a day, so not a connection we count.