TP 1929 then FR 1791 at Lisbon
Porto → Lisbon → Luxembourg
Timetable, Lisbon time
15:30TP 1929 from Porto at the gate
15:00FR 1791 to Luxembourg leaves the gate
23 h 30 apart on the timetable, overnight
FR 1791 leaves 23 h 30 after TP 1929 arrives on the timetable: more than half a day, so not a connection we count.