In my office i have an excel data sheet on a large monitor that is potentially readable from the reception desk.
To prevent a confidentiality breach I use a hyperlinked button to switch to a blank sheet to hide the data as required and a similarly linked button to return to the data sheet.

the hypothetical question is this

Can the hyperlink be enabled to activate after maybe 60 seconds or more, to act as a screen saver in the event I have to leave the office urgently and don't have time to click the link (or an alternative option).

Now I know some one will say why not use the windows screen saver?

The PC it resides on is a multi user machine that carries other databases that need to remain live and have inbuilt time out options and we don't want it to be constantly logging the user out, so screensavers have been disabled, each of the other programs use separate log ins.

the excel sheet is the only one that doesn't so far have a means of auto hiding data.

this may just be wishful thinking on my part