FR 155 then FR 5054 at Madrid
Bristol → Madrid → Luxembourg
Timetable, Madrid time
20:15FR 155 from Bristol at the gate
17:05FR 5054 to Luxembourg leaves the gate
20 h 50 apart on the timetable, overnight
FR 5054 leaves 20 h 50 after FR 155 arrives on the timetable: more than half a day, so not a connection we count.