SK 9 then SK 81 at Arlanda
Lulea → Stockholm → Visby
Timetable, Stockholm time
12:55SK 9 from Lulea at the gate
10:20SK 81 to Visby leaves the gate
21 h 25 apart on the timetable, overnight
SK 81 leaves 21 h 25 after SK 9 arrives on the timetable: more than half a day, so not a connection we count.