FR 4584 then FR 7543 at Barcelona
Porto → Barcelona → Manchester
Timetable, Barcelona time
18:35FR 4584 from Porto at the gate
11:35FR 7543 to Manchester leaves the gate
17 h apart on the timetable, overnight
FR 7543 leaves 17 h after FR 4584 arrives on the timetable: more than half a day, so not a connection we count.