I am trying to make a powerpoint slide to display a "current wait time" that can be updated from a user on a different computer.

I have tried linking the powerpoint to an excel document, saving both documents to the network drive, and then running the powerpoint from one computer and updating the spreadsheet from another. However, it seems that as long as the powerpoint is opened by a different user it won't update in real time.

Does anyone have any ideas?