IB 5371 then LL 5480 at Barcelona
Firenze → Barcelona → Nantes
Timetable, Barcelona time
11:35IB 5371 from Firenze at the gate
10:45LL 5480 to Nantes leaves the gate
23 h 10 apart on the timetable, overnight
LL 5480 leaves 23 h 10 after IB 5371 arrives on the timetable: more than half a day, so not a connection we count.