How often do Global Post Feeds Update?

I installed Global Posts Feed. It does not install quite the same as it states in the Usage section, but hey ho :slight_smile:

Anyway, I have the right feed, cos when I go to the link it is showing feeds from different blogs on the network (multisite).

I then use the RSS widget on the footer of each new blog we create (and the main site) and include the feed URL.

It showed up the first post that we ran to test, but since we added another blog and new post, the feed if you go direct shows a new post, but it is not showing up on the main or two test sites?

Why is that and how do I change it please?

URL to the feed is: