Please read the FAQ.
This is answered there.
Your xml file is updated every 4 hours.
The 4 hour starts when you last generated the xml file.
That means, when you started your trial or last clicked the save button, which always generates the xml file freshly.
It is an ever changing time.
No need to know it.
Update your Plex every 4-12 hours and you are good to go.
Please stop asking for features befoire you fully know the site and read the FAQ and watched all the tutorial videos.
This is answered there.
Your xml file is updated every 4 hours.
The 4 hour starts when you last generated the xml file.
That means, when you started your trial or last clicked the save button, which always generates the xml file freshly.
It is an ever changing time.
No need to know it.
Update your Plex every 4-12 hours and you are good to go.
Please stop asking for features befoire you fully know the site and read the FAQ and watched all the tutorial videos.