FR 4500 then FR 7152 at Dublin
Cologne → Dublin → Santander
Timetable, Dublin time
11:00FR 4500 from Cologne at the gate
06:05FR 7152 to Santander leaves the gate
19 h 05 apart on the timetable, overnight
FR 7152 leaves 19 h 05 after FR 4500 arrives on the timetable: more than half a day, so not a connection we count.