TK 6687 then GQ 841 at Vienna
Istanbul → Vienna → Athens
Timetable, Vienna time
07:55TK 6687 from Istanbul at the gate
20:55GQ 841 to Athens leaves the gate
13 h apart on the timetable
GQ 841 leaves 13 h after TK 6687 arrives on the timetable: more than half a day, so not a connection we count.