FR 4546 then W4 6316 at Barcelona
Porto → Barcelona → Milan
Timetable, Barcelona time
23:25FR 4546 from Porto at the gate
13:10W4 6316 to Milan leaves the gate
13 h 45 apart on the timetable, overnight
W4 6316 leaves 13 h 45 after FR 4546 arrives on the timetable: more than half a day, so not a connection we count.