FR 4586 then IB 5352 at Barcelona
Porto → Barcelona → Milan
Timetable, Barcelona time
09:20FR 4586 from Porto at the gate
07:40IB 5352 to Milan leaves the gate
22 h 20 apart on the timetable, overnight
IB 5352 leaves 22 h 20 after FR 4586 arrives on the timetable: more than half a day, so not a connection we count.