LH 233 then 4Y 900 at Frankfurt
Rome → Frankfurt am Main → Dubrovnik
Timetable, Frankfurt am Main time
15:25LH 233 from Rome at the gate
09:254Y 900 to Dubrovnik leaves the gate
18 h apart on the timetable, overnight
4Y 900 leaves 18 h after LH 233 arrives on the timetable: more than half a day, so not a connection we count.