W6 4401 then FR 572 at Madrid
Sofia → Madrid → Porto
Timetable, Madrid time
19:50W6 4401 from Sofia at the gate
16:40FR 572 to Porto leaves the gate
20 h 50 apart on the timetable, overnight
FR 572 leaves 20 h 50 after W6 4401 arrives on the timetable: more than half a day, so not a connection we count.