SN 2548 then SN 3751 at Brussels
Krakow → Brussels → Valencia
Timetable, Brussels time
16:30SN 2548 from Krakow at the gate
10:30SN 3751 to Valencia leaves the gate
18 h apart on the timetable, overnight
SN 3751 leaves 18 h after SN 2548 arrives on the timetable: more than half a day, so not a connection we count.