How many concurrent connections can ACS handle at once?

Hi Experts,
Could you please let me know how many concurrent connections ACS can handle at once?
Is there any limitation on it?
Our ACS version is 4.0 (1) build 27.
Thanks in advance for your help and have a nice day!

It depends on many other factors but as far as I know ACS can handle upto 40 Auth request per second*
*Condition Apply
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