You can use the Cache-Control HTTP header to specify how long a page or resource should be cached. For example, if you want to cache a page for one hour, you can use the following Cache-Control header: Cache-Control: max-age=3600 You can also use the Expires header to specify a specific expiration date and time for a page or resource. For example, if you want to cache a page until 12pm tomorrow, you can use the following Expires header: Expires: Thu, 01 Jan 1970 00:00:00 GMT If you're using Apache, you can use the mod_expires module to set expiration dates and times for your pages and resources.