SK 1768 then SK 83 at Arlanda
Prague → Stockholm → Visby
Timetable, Stockholm time
21:15SK 1768 from Prague at the gate
15:00SK 83 to Visby leaves the gate
17 h 45 apart on the timetable, overnight
SK 83 leaves 17 h 45 after SK 1768 arrives on the timetable: more than half a day, so not a connection we count.