DE 4410 then 4Y 900 at Frankfurt
Prague → Frankfurt am Main → Dubrovnik
Timetable, Frankfurt am Main time
12:55DE 4410 from Prague at the gate
09:254Y 900 to Dubrovnik leaves the gate
20 h 30 apart on the timetable, overnight
4Y 900 leaves 20 h 30 after DE 4410 arrives on the timetable: more than half a day, so not a connection we count.