5 U.S.C. § 6127 — Compressed schedules; agencies authorized to use

(a) Despite section 6101 of this title, each agency may establish programs which use a 4-day workweek or other compressed schedule. (b) (1) An employee in a unit about which an organization of Government employees has not been accorded exclusive recognition must not be required to participate in any program under subsection (a) unless a majority of the employees in that unit who, but for this paragraph, would be included in that program have voted to be so included. (2) Upon written request to any agency by an employee, the agency, if it decides that participation in a program under subsection (a) would impose a personal hardship on that employee, must— (A) except that employee from that program; or (B) reassign that employee to the first position within the agency— (i) which becomes vacant after that determination, (ii) which is not included within that program, (iii) for which that employee is qualified, and (iv) which is acceptable to the employee. A determination by an agency under this paragraph must be made by 10 days after the day on which a written request for that determination is received by the agency.