SN 3812 then SN 3819 at Brussels
Porto → Brussels → Lisbon
Timetable, Brussels time
16:10SN 3812 from Porto at the gate
15:40SN 3819 to Lisbon leaves the gate
23 h 30 apart on the timetable, overnight
SN 3819 leaves 23 h 30 after SN 3812 arrives on the timetable: more than half a day, so not a connection we count.