Riyadh is 12 hours ahead of Anchorage
There is no standard 8-to-6 overlap. Someone joins early or late.
Anchorage and Riyadh are 12 hours apart, and that gap is wide enough that their normal 9-to-5 workdays never quite touch. If you meet regularly, fix one off-hours slot and rotate it between Anchorage and Riyadh so the burden doesn't fall on one team. Finally, Anchorage observes daylight saving and Riyadh doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.