Seattle is typically 17 hours behind Tokyo. When it's 3:00 PM in Tokyo, it's 10:00 PM the previous day in Seattle. Japan does not observe daylight saving time, while Washington state does.
During US daylight saving time (mid-March to early November), the difference is 16 hours. During US standard time (November to March), it's 17 hours.
Optimal meeting window: 4:00 PM - 7:00 PM Seattle time (9:00 AM - 12:00 PM Tokyo next day). This catches morning business hours in Tokyo.
Nintendo and other Japanese companies with Seattle offices often schedule calls at 5:00 PM Pacific to reach Tokyo at 10:00 AM.