SK 1842 then AY 820 at Arlanda
Rome → Stockholm → Helsinki
Timetable, Stockholm time
23:55SK 1842 from Rome at the gate
21:15AY 820 to Helsinki leaves the gate
21 h 20 apart on the timetable, overnight
AY 820 leaves 21 h 20 after SK 1842 arrives on the timetable: more than half a day, so not a connection we count.