EC 7154 then LA 5765 at Barcelona
Milan → Barcelona → Firenze
Timetable, Barcelona time
23:15EC 7154 from Milan at the gate
15:40LA 5765 to Firenze leaves the gate
16 h 25 apart on the timetable, overnight
LA 5765 leaves 16 h 25 after EC 7154 arrives on the timetable: more than half a day, so not a connection we count.