Operating Time Posted on 11th December 201514th May 2021 by ThePD (The Project Definition) Operating Time is the period of time a system or an equipment is in its operating condition. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Operation and tagged time. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.