I think this only for the current information for the TEG, so you have to keep polling it. Don't know how often it is refreshed.Thanks for the tip. This was the last bit of data I was still getting from the cloud API. Now I can get all my stats locally from the TEG API and save the extra auth.
BTW if using the web browser you can log on in one window to authenticate and then you can use the API request in the same browser session.