PU 502 then W4 6460 at Madrid
Buenos Aires → Madrid → Milan
Timetable, Madrid time
15:45PU 502 from Buenos Aires at the gate
13:10W4 6460 to Milan leaves the gate
21 h 25 apart on the timetable, overnight
W4 6460 leaves 21 h 25 after PU 502 arrives on the timetable: more than half a day, so not a connection we count.