KM 514 then OS 553 at Vienna
Valletta → Vienna → Rome
Timetable, Vienna time
19:45KM 514 from Valletta at the gate
12:40OS 553 to Rome leaves the gate
16 h 55 apart on the timetable, overnight
OS 553 leaves 16 h 55 after KM 514 arrives on the timetable: more than half a day, so not a connection we count.