Last year, Google Docs, Sheets, and Slides introduced an Activity dashboard to provide stats and easily see who has viewed a document.

To make collaboration more efficient and effective, Google Drive is adding a new Activity dashboard that lists the view history of a shared file. Intended to improve the follow-up experience, it ...

Google is adding a new activity dashboard to Docs, Sheets, and Slides that will show you who viewed your files and when.

To create a nice little dashboard, all you need on top of this is some basic Google Sheets functions such as cell references, multiplication and subtraction.