LH 977 then 4Y 900 at Frankfurt
Dublin → Frankfurt am Main → Dubrovnik
Timetable, Frankfurt am Main time
12:10LH 977 from Dublin at the gate
09:254Y 900 to Dubrovnik leaves the gate
21 h 15 apart on the timetable, overnight
4Y 900 leaves 21 h 15 after LH 977 arrives on the timetable: more than half a day, so not a connection we count.