29 C.F.R. § 790.12 “Portion of the day.”
Title 29 - Labor
A “preliminary” or “postliminary” activity of the kind referred to in section 4 of the Portal Act is compensable under a contract, custom, or practice within the meaning of that section “only when it is engaged in during the portion of the day with respect to which it is so made compensable.”84 84 Section 4(c) of the Portal Act (set out in full in §790.3). 85 See §§790.4–790.6. 86 Conference Report, pp. 12, 13. 87 See Conference Report, p. 13; §§790.4(c) and 790.5(b). The scope of section 4(c) is narrower in this respect than that of section 2(b), which is couched in identical language. Cf. Conference Report, pp. 9, 10; pp. 12, 13. See also §790.23.
Title 29: Labor
PART 790—GENERAL STATEMENT AS TO THE EFFECT OF THE PORTAL-TO-PORTAL ACT OF 1947 ON THE FAIR LABOR STANDARDS ACT OF 1938
Provisions Relating to Certain Activities Engaged in by Employees on or After May 14, 1947
§ 790.12 “Portion of the day.”

