[Code of Federal Regulations] [Title 20, Volume 1] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 20CFR220.28] [Page 268] TITLE 20--EMPLOYEES' BENEFITS CHAPTER II--RAILROAD RETIREMENT BOARD PART 220_DETERMINING DISABILITY--Table of Contents Subpart D_Disability Under the Railroad Retirement Act for Any Regular Employment Sec. 220.28 How long the impairment must last. Unless the claimant's impairment is expected to result in death, it must have lasted or must be expected to last for a continuous period of at least 12 months. This is known as the duration requirement. [[Page 269]]