'Concurrent Users Count

I have a web application which is working in production and there are 2000+ users of my application. Now I have to perform performance testing on the system so is there any idea how many concurrent users will be sending requests at a single time? It is presumed that not all the 2000+ users hit the server at the same time.

I am going to use JMeter for load testing of my system so how many concurrent users should I assume must be hitting the server at the same time?

Is there any practice being followed in the world or does it vary application-to-application?



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