Hi! My company uses DNN to support the employee benefits of 80 large businesses through web portals. Many of our businesses require same day updates during the open enrollment period. Is there a way to make a change to a page and have it update at an adjustable time? For instance, could I add a hyperlinked button to a home page and have that update take effect at 6 pm three days from now? 

Any guidance would be greatly appreciated.

It depends on the module that is used.
The Announcements module lets you start/stop displaying content and certain times.
You can use the Form & List module and a filter to show records based on the current date/time.
In general, though, you create two content items where one stops at the desired time and then other one starts at the desired time.
Announcements module would probably be the most straight forward.