CFR > Title 29 - Labor > SUBTITLE B—Regulations Relating to Labor > CHAPTER XL—PENSION BENEFIT GUARANTY CORPORATION (parts 4000 to 4907) > SUBCHAPTER A—GENERAL (parts 4000 to 4003) > PART 4000—FILING, ISSUANCE, COMPUTATION OF TIME, AND RECORD RETENTION > SUBPART D—Computation of Time (§4000.41 to §4000.43)