Decrease update time for group recent activities

Hello,

I’m displaying recent activities of a running group using a shortcode within the template files of my site.

How often does the plugin poll for new information? It seems to take many hours between refreshes. Is there a way to decrease the time to perhaps every 15 minutes? There are hundreds of runners in the group and I would like to display more up-to-date information.

I have found that clearing the cache from the admin area does refresh the data but this is obviously a manual process.

Any help would be appreciated.
Thanks