[Plugin: Google Plus Feed Widget] Caching data – how to lower the cache

This plugins is written so it caches the results, this saves it from having to poll every time a page loads (its a good thing).
Sometimes the defauly cache time is too long for some people, it can only update every 12 hours.
If you want to update it more often you need to add the following code into the functions.php of your theme

add_filter( ‘wp_feed_cache_transient_lifetime’, create_function(‘$a’, ‘return 600;’) );

The explanation can be found here on how that works.

https://casabona.org/blog/2009/08/07/qt-increase-the-wordpress-rss-widget-refresh-rate/

https://www.ads-software.com/extend/plugins/google-plus-feed-widget/