Civil Complaints against Federal Agencies or Officials must be filed within 6 years of the injury (some exceptions)

United States Code
Title 28-JUDICIARY AND JUDICIAL PROCEDURE
PART VI-PARTICULAR PROCEEDINGS
CHAPTER 161-UNITED STATES AS PARTY GENERALLY

§2401. Time for commencing action against United States

(a) Except as provided by chapter 71 of title 41, every civil action commenced against the United States shall be barred unless the complaint is filed within six years after the right of action first accrues. The action of any person under legal disability or beyond the seas at the time the claim accrues may be commenced within three years after the disability ceases.