A3 683 then GQ 670 at Athens
Bologna → Athens → Istanbul
Timetable, Athens time
13:35A3 683 from Bologna at the gate
06:55GQ 670 to Istanbul leaves the gate
17 h 20 apart on the timetable, overnight
GQ 670 leaves 17 h 20 after A3 683 arrives on the timetable: more than half a day, so not a connection we count.