It is recommended for most sites to set their browser caching to one week. While it may seem you want everyone to pull fresh information every time, that also means each time your site loads every resource needed for that page must be downloaded by the browser. This can put load on the server and slow down load speeds across the board.
It is recommended that you set your browser caching at one week.
Having your caching set to one week means that most regularly returning visitors, including internal employees checking your site, will be pulling from their local system and not impacting your server processing.