Riyadh is 1 hour ahead of Munich
Best overlap: 8:00 AM to 5:00 PM in Munich is 9:00 AM to 6:00 PM in Riyadh.
Plan around 8:00 AM to 5:00 PM in Munich, which is 9:00 AM to 6:00 PM in Riyadh, to catch everyone during office hours. The overlap is wide at 9 hours, so you can protect mornings for deep work and still find plenty of meeting time. For part of the year the maths changes: Munich observes daylight saving, Riyadh does not, shifting the overlap by an hour.