of extraordinary complexity shall not exceed 300 pages, not including any citations or appendices. (2) Environmental assessments An environmental assessment shall not exceed 75 pages, not including any citations or appendices. (f) Sponsor preparation A lead agency shall prescribe procedures to allow a project sponsor to prepare an environmental assessment or an environmental impact statement under the supervision of the agency. Such agency may provide such sponsor with appropriate guidance and assist in the preparation. The lead agency shall independently evaluate the environmental document and shall take responsibility for the contents. (g) Deadlines (1) In general Except as provided in paragraph (2), with respect to a proposed agency action, a lead agency shall complete, as applicable— (A) the environmental impact statement not later than the date that is 2 years after the sooner of, as applicable— (i) the date on which such agency determines that section 102(2)(C) requires the issuance of an environmental impact statement with respect to such action