SK 51 then SK 722 at Arlanda
Sundsvall → Stockholm → Helsinki
Timetable, Stockholm time
16:30SK 51 from Sundsvall at the gate
15:30SK 722 to Helsinki leaves the gate
23 h apart on the timetable, overnight
SK 722 leaves 23 h after SK 51 arrives on the timetable: more than half a day, so not a connection we count.