Reykjavik is 3 hours behind Riyadh
Best overlap: 11:00 AM to 6:00 PM in Riyadh is 8:00 AM to 3:00 PM in Reykjavik.
If you set up a recurring sync, 11:00 AM to 6:00 PM in Riyadh (8:00 AM to 3:00 PM in Reykjavik) is the natural home for it. Because you share 7 hours of the workday, there's no need to compromise; book the time that suits the meeting, not the map.