SN 2735 then U2 6842 at Zurich
Brussels → Zurich → Porto
Timetable, Zurich time
19:20SN 2735 from Brussels at the gate
16:50U2 6842 to Porto leaves the gate
21 h 30 apart on the timetable, overnight
U2 6842 leaves 21 h 30 after SN 2735 arrives on the timetable: more than half a day, so not a connection we count.