Reykjavik is 1 hour behind Vienna
Best overlap: 9:00 AM to 6:00 PM in Vienna is 8:00 AM to 5:00 PM in Reykjavik.
If you set up a recurring sync, 9:00 AM to 6:00 PM in Vienna (8:00 AM to 5:00 PM in Reykjavik) is the natural home for it. Reykjavik is 1 hour behind Vienna, but the generous 9-hour window means both teams can meet well within their normal day. Keep an eye on the calendar — Vienna observes daylight saving and Reykjavik doesn't, which nudges this window by an hour twice a year.