Moscow is 11 hours ahead of Portland
There is no standard 8-to-6 overlap. Someone joins early or late.
Portland and Moscow have no natural overlap. The 11-hour gap is simply too large for regular working hours to meet. Treat the handoff like a relay — Portland wraps up and leaves notes for Moscow to pick up as their day begins. The difference isn't constant year-round: Portland adjusts for daylight saving while Moscow holds steady.