API Purge all files limit

In the documentation i can see the API request limit is 1200 request / 5 min (4 per second). I have scenarios where i need to purge all files in the cache quite often and when i try to do it manually trough the control panel i have a popup alert which says something like ‘you can’t purge all files that often’ and i need to wait to request a new purge.

Do i have some of this limitation with this specific request? or i can make a request every second for example (300 requests / 5 min) without problem.