EW 7520 then W4 6316 at Barcelona
Hamburg → Barcelona → Milan
Timetable, Barcelona time
18:45EW 7520 from Hamburg at the gate
13:10W4 6316 to Milan leaves the gate
18 h 25 apart on the timetable, overnight
W4 6316 leaves 18 h 25 after EW 7520 arrives on the timetable: more than half a day, so not a connection we count.