19 CFR §10.413

A certification that is completed, signed and dated in accordance with the requirements listed in § 10.411 of this subpart will be accepted by CBP as valid for four years from the date on which the certification was signed. If the Center director determines that a certification is illegible or defective or has not been completed in accordance with § 10.411 of this subpart, the importer will be given a period of not less than five business days to submit a corrected certification.