Due to the name, some people mistake the Entry Processes limit on cPanel as the total number of visitors a website can have at any one time, but this is not the case. Entry Processes are the total number of PHP scripts running on your website at any specific time.
An entry process usually takes around 1 second to complete so unless you have an extremely busy website, in which case you should look for a more dedicated service such as VPS or Dedicated Server then the chances of multiple visitors all entering your website at the exact same second is remote at best.
For shared hosting the limit for entry processes are usually between 20 and 30. Remember that these limits are for the whole cPanel account and not per domain name.