precise amount or extent of work performed or evidence to show that the inference drawn from the employee’s evidence is not reasonable. . II Amendments to the Portal-to-Portal Act of 1947 201. Increasing and tolling statute of limitations Section 6 of the Portal-to-Portal Act of 1947 ( 29 U.S.C. 255 ) is amended— (1) in the matter preceding subsection (a), by striking minimum