SK 27 then SK 81 at Arlanda
Umea → Stockholm → Visby
Timetable, Stockholm time
13:15SK 27 from Umea at the gate
10:20SK 81 to Visby leaves the gate
21 h 05 apart on the timetable, overnight
SK 81 leaves 21 h 05 after SK 27 arrives on the timetable: more than half a day, so not a connection we count.