FR 3073 then FR 878 at Barcelona
Prague → Barcelona → Venezia
Timetable, Barcelona time
11:15FR 3073 from Prague at the gate
08:30FR 878 to Venezia leaves the gate
21 h 15 apart on the timetable, overnight
FR 878 leaves 21 h 15 after FR 3073 arrives on the timetable: more than half a day, so not a connection we count.