FR 153 then FR 5203 at Dublin
Leeds → Dublin → Sofia
Timetable, Dublin time
13:45FR 153 from Leeds at the gate
08:20FR 5203 to Sofia leaves the gate
18 h 35 apart on the timetable, overnight
FR 5203 leaves 18 h 35 after FR 153 arrives on the timetable: more than half a day, so not a connection we count.