How to handle the notarization and authentication procedures of the embassy of the same person in the United States? How long will it take?

The same person declares that the authentication procedure at the US Embassy is as follows:

Proof materials: the original statement of the same person in the United States, the applicant's identity certificate and an application form for certification.

The certification time is 3 to 15 working days.

Certification process: notarized by American notary, certified by US Secretary of State, and certified by China Embassy and Consulate in the United States.