From page 11 of the INHA Policy Statements… lots of good stuff in there.
REST PERIODS
Each employee of INHA may be granted two separate rest periods of fifteen minutes each during each half of an 8-hour shift, but not in conjunction with the lunch period. The rest period is intended to offer a brief rest for the particular duties of the moment and is to be taken at the job location. Rest periods shall not be combined or banked as to provide an extended rest or lunch period or shorten the working day. Supervisors shall schedule rest periods to facilitate smooth running operations.
LUNCH PERIODS
All employees of INHA shall eat lunch on their own time and shall not be paid for such time. The lunch period will be normally one (1) hour for full-time administrative employees and 1/2 hour for employees working in visitor centers during any normal 8-hour work period. Lunch periods should be scheduled to facilitate continuous and efficient service to the public through the course of the working day.