PU 502 then UX 7703 at Madrid
Buenos Aires → Madrid → Barcelona
Timetable, Madrid time
15:45PU 502 from Buenos Aires at the gate
15:15UX 7703 to Barcelona leaves the gate
23 h 30 apart on the timetable, overnight
UX 7703 leaves 23 h 30 after PU 502 arrives on the timetable: more than half a day, so not a connection we count.