Asynchronous support to run crews in a multi thread process

[AMadhan1]

I want to know how to run a multi threaded process for crews asynchronously in production. I know that I can use kickoff_asnc to run multiple crews at a time. How can I invoke that capability in production i.e to parallely run the crews for each user at a time. Currently how many threads CrewAI allow to run concurrently?
Pls help.