alien shall be considered to have failed to maintain continuous presence in the United States under subsection (a) if the alien has departed from the United States for any period in excess of 90 days or for any periods in the aggregate exceeding 180 days, unless such departure was authorized by the Secretary of Homeland Security. (2) Exception An alien who departed from the United States after the date of enactment of this Act shall not be considered to have failed to maintain continuous presence in the United States if the alien’s absences from the United States are brief, casual, and innocent, whether or not such absences were authorized by the Secretary. (3) Extensions for exceptional circumstances The Secretary of Homeland Security may extend the time periods described in paragraph (1) if the alien demonstrates that the failure to timely return to the United States was due to exceptional circumstances. Exceptional circumstances sufficient to justify an extension may include the serious illness of the alien, or death or serious illness of a spouse, parent, grandparent, sibling, or child. (d) Exemption from numerical limitations Nothing in this section may be construed to apply a numerical limitation on the number of aliens who may be eligible for cancellation of removal or adjustment of status under this section. (e) Regulations (1) Proposed regulations Not later than 180 days after the date of enactment of this Act, the Secretary of Homeland Security shall publish proposed regulations implementing this section. Such regulations shall be effective immediately on an interim basis, but are subject to change and revision after public notice and opportunity for a period for public comment. (2) Interim, final regulations Within a reasonable time and no later than 180 days after publication of the interim regulations in accordance with paragraph (1), the Secretary of Homeland Security shall publish final regulations implementing this section. (f) Administrative review Any alien receiving an adverse determination on