Reference 32/7. That is the limit for a two pilot crew under flag ops. There is no seven day limit for a three or four pilot crew, except that once you get back to the US, you can't fly domestically if you are over 30/7.

The twice the flight time free of duty at home station only applies if at least one of the legs was scheduled to exceed 12 hours, requiring a four pilot crew. Thus, an ANC-HKG-ANC flight would not be included under this rule.

Joe