5 U.S. Code § 3346 - Time limitation
(a) Except in the case of a vacancy caused by sickness, the person serving as an acting officer as described under section 3345 may serve in the office—
(1) If the first nomination for the office is rejected by the Senate, withdrawn, or returned to the President by the Senate, the person may continue to serve as the acting officer for no more than 210 days after the date of such rejection, withdrawal, or return.
(2) Notwithstanding paragraph (1), if a second nomination for the office is submitted to the Senate after the rejection, withdrawal, or return of the first nomination, the person serving as the acting officer may continue to serve—
Source(Added Pub. L. 105–277, div. C, title I, § 151(b),Oct. 21, 1998, 112 Stat. 2681–612.)
A prior section 3346,Pub. L. 89–554, Sept. 6, 1966, 80 Stat. 426, provided for details to subordinate offices, prior to repeal by Pub. L. 105–277, div. C, title I, § 151(b), (d)(1),Oct. 21, 1998, 112 Stat. 2681–611, 2681–616, effective 30 days after Oct. 21, 1998. See section 3345 of this title.