SN 3728 then DS 1530 at Brussels
Madrid → Brussels → Geneva
Timetable, Brussels time
19:55SN 3728 from Madrid at the gate
13:25DS 1530 to Geneva leaves the gate
17 h 30 apart on the timetable, overnight
DS 1530 leaves 17 h 30 after SN 3728 arrives on the timetable: more than half a day, so not a connection we count.