FR 4546 then EC 7153 at Barcelona
Porto → Barcelona → Milan
Timetable, Barcelona time
08:45FR 4546 from Porto at the gate
07:20EC 7153 to Milan leaves the gate
22 h 35 apart on the timetable, overnight
EC 7153 leaves 22 h 35 after FR 4546 arrives on the timetable: more than half a day, so not a connection we count.