How to add time with hours, minites, seconds increments in Excel?

Supposing you are a stock investor, and you need to record the price variety of a certain stock every 20 minutes, what would you do to quickly create the time list with 20 minutes increments? This vedio shows you several methods to solve it in details. Or you can browse the step-by-step guide via the following hyperlink: https://www.extendoffice.com/document...