Cache

Hey,

Usually the default cache duration according to codex is 12h

However, depends on the plugins or theme you are using, some of them may alter this value.
However you can control directly from the shortcode the cache time if you are following this doc: http://docs.themeisle.com/article/547-how-to-change-cache-lifetime-for-a-specific-feed

Let me know if you have any other questions.