EC 3655 then A3 998 at Athens
Milan → Athens → Istanbul
Timetable, Athens time
10:20EC 3655 from Milan at the gate
00:40A3 998 to Istanbul leaves the gate
14 h 20 apart on the timetable, overnight
A3 998 leaves 14 h 20 after EC 3655 arrives on the timetable: more than half a day, so not a connection we count.