FR 4438 then OS 554 at Fiumicino
Riga → Rome → Vienna
Timetable, Rome time
19:05FR 4438 from Riga at the gate
15:05OS 554 to Vienna leaves the gate
20 h apart on the timetable, overnight
OS 554 leaves 20 h after FR 4438 arrives on the timetable: more than half a day, so not a connection we count.