A3 721 then EC 3656 at Athens
Lisbon → Athens → Milan
Timetable, Athens time
18:00A3 721 from Lisbon at the gate
11:10EC 3656 to Milan leaves the gate
17 h 10 apart on the timetable, overnight
EC 3656 leaves 17 h 10 after A3 721 arrives on the timetable: more than half a day, so not a connection we count.