DY 999 then DY 5521 at Oslo
Billund → Oslo → Barcelona
Timetable, Oslo time
16:35DY 999 from Billund at the gate
14:05DY 5521 to Barcelona leaves the gate
21 h 30 apart on the timetable, overnight
DY 5521 leaves 21 h 30 after DY 999 arrives on the timetable: more than half a day, so not a connection we count.