GQ 891 then EC 3656 at Athens
Düsseldorf → Athens → Milan
Timetable, Athens time
15:30GQ 891 from Düsseldorf at the gate
11:10EC 3656 to Milan leaves the gate
19 h 40 apart on the timetable, overnight
EC 3656 leaves 19 h 40 after GQ 891 arrives on the timetable: more than half a day, so not a connection we count.