OU 4456 then DS 1530 at Brussels
Zagreb → Brussels → Geneva
Timetable, Brussels time
19:55OU 4456 from Zagreb at the gate
16:00DS 1530 to Geneva leaves the gate
20 h 05 apart on the timetable, overnight
DS 1530 leaves 20 h 05 after OU 4456 arrives on the timetable: more than half a day, so not a connection we count.