Sentence:  The Secretary of the Interior shall submit a report of his findings , together with recommendations for an effective safety program for metal and nonmetallic mines ( excluding coal and lignite mines ) based upon such findings , to the Congress not more than two <WSD>years</WSD> after the date of enactment of this Act . 
Meaning of the word marked with <WSD> tags:  a period of time containing 365 (or 366) days