EC 3749 then LA 5775 at Barcelona
Milan → Barcelona → Nantes
Timetable, Barcelona time
21:30EC 3749 from Milan at the gate
13:40LA 5775 to Nantes leaves the gate
16 h 10 apart on the timetable, overnight
LA 5775 leaves 16 h 10 after EC 3749 arrives on the timetable: more than half a day, so not a connection we count.