Istanbul is 12 hours ahead of Anchorage
There is no standard 8-to-6 overlap. Someone joins early or late.
For Anchorage and Istanbul, the standard workday in one city falls outside office hours in the other — that's what 12 hours of distance does. Keep live syncs short and infrequent, and let written updates carry the day-to-day between Anchorage and Istanbul. Just remember Anchorage changes its clocks for daylight saving and Istanbul doesn't, so confirm the overlap whenever the seasons turn.