Haw. Rev. Stat. § 302A-637
All cafeteria workers employed in the department shall be employed and have their compensation adjusted in accordance with chapter 76 and the appropriate collective bargaining agreement, executive order, executive directive, or rule, and the monthly rates of basic compensation so determined shall be payable for employment over a twelve-month period. All cafeteria workers shall be employed on a full-time basis, except that a limited number of part-time workers may be employed by the department. No cafeteria worker employed on a part-time basis shall work less than twenty hours per week. The department shall establish a schedule, based on factors that determine the need for part-time workers, fixing the number of part-time workers that may be employed by the department.
HRS § 302A-637