FR 847 then FR 4545 at Barcelona
Milan Bergamo → Barcelona → Porto
Timetable, Barcelona time
16:20FR 847 from Milan Bergamo at the gate
10:20FR 4545 to Porto leaves the gate
18 h apart on the timetable, overnight
FR 4545 leaves 18 h after FR 847 arrives on the timetable: more than half a day, so not a connection we count.