Your users could get that type of functionality if they installed an auto-refresh extensions for their browser. Here's an example for Chrome: https://chrome.google.com/webstore/detail/easy-auto-refresh/aabcgdmkeabbnleenpncegpcngjpnjkc?hl=en
There is no auto-refresh functionality currently built into the Tableau Server / Online product (short of waiting for the VizQL session to time out). Here are a few ideas submitted by customers requesting this functionality. You should vote them up if this is something you'd like to see added in.
Hope this helps!