LX 1956 then IB 5376 at Barcelona
Zurich → Barcelona → Firenze
Timetable, Barcelona time
19:05LX 1956 from Zurich at the gate
18:45IB 5376 to Firenze leaves the gatealso LL 5376, VY 6076
23 h 40 apart on the timetable, overnight
IB 5376 leaves 23 h 40 after LX 1956 arrives on the timetable: more than half a day, so not a connection we count.