GQ 821 then EC 3656 at Athens
Rome → Athens → Milan
Timetable, Athens time
16:00GQ 821 from Rome at the gate
11:10EC 3656 to Milan leaves the gate
19 h 10 apart on the timetable, overnight
EC 3656 leaves 19 h 10 after GQ 821 arrives on the timetable: more than half a day, so not a connection we count.