Time you spend on activities which are necessary to prepare for or complete your work may be time that should be counted for overtime purposes. Such activities that are an integral part of the principal activity should be included. Id .
Example:
Employees who must oil, grease, or
clean his machine, or install a new tool.
A factory worked required to begin work 30 min. early to hand out materials
Chemical plant employee that must change into a protective suit before work