29 C.F.R. § 553.230 : Labor — REGULATIONS RELATING TO LABOR — WAGE AND HOUR DIVISION, DEPARTMENT OF LABOR — REGULATIONS — APPLICATION OF THE FAIR LABOR STANDARDS ACT TO EMPLOYEES OF STATE AND LOCAL GOVERNMENTS — FIRE PROTECTION AND LAW ENFORCEMENT EMPLOYEES OF PUBLIC AGENCIES —OVERTIME COMPENSATION RULES — Maximum hours standards for work periods of 7 to 28 days-section 7(k)

(a) For those employees engaged in fire protection activities who have a work period of at least 7 but less than 28 consecutive days, no overtime compensation is required under section 7(k) until the number of hours worked exceeds the number of hours which bears the same relationship to 212 as the number of days in the work period bears to 28.
(b) For those employees engaged in law enforcement activities (including security personnel in correctional institutions) who have a work period of at least 7 but less than 28 consecutive days, no overtime compensation is required under section 7(k) until the number of hours worked exceeds the number of hours which bears the same relationship to 171 as the number of days in the work period bears to 28.
(c) The ratio of 212 hours to 28 days for employees engaged in fire protection activities is 7.57 hours per day (rounded) and the ratio of 171 hours to 28 days for employees engaged in law enforcement activities is 6.11 hours per day (rounded). Accordingly, overtime compensation (in premium pay or compensatory time) is required for all hours worked in excess of the following maximum hours standards (rounded to the nearest whole hour):

Work period (days) Maximum hours standards
Fire protection Law enforcement
28 212 171
27 204 165
26 197 159
25 189 153
24 182 147
23 174 141
22 167 134
21 159 128
20 151 122
19 144 116
18 136 110
17 129 104
16 121 98
15 114 92
14 106 86
13 98 79
12 91 73
11 83 67
10 76 61
9 68 55
8 61 49
7 53 43

29 C.F.R. § 553.230