Welcome to the Auth0 Community!
I understand you have questions about timeouts when using the Management API in Rules.
First, I would recommend that if you are already encountering timeouts with the Management API, please review this documentation on the best practices for performance.
Next, I recommend reading this FAQ that explains in greater detail about handling timeouts in Rules.
In general, the total execution time for all Rules should not exceed 20 seconds. Therefore, when using the Management API in Rules, you will have to ensure that the API calls do not timeout to avoid any timeout errors from Rules.
Please let me know if you have any questions.
Thank you.