Hi,
Your entry process limit is the total number of processes your account can run at the same time, and it's hard to estimate how many visitors this would correspond to, since it depends on your site and any cron jobs you are running. For example, when someone requests a PHP webpage, a PHP process is started and then ended almost immediately. Additionally, if you have a cron job, this would spawn a process when the job runs, and then end the process once it is complete. Your entry process limit is usually only a problem if you are getting lots of visitors hitting your website all at the same time, which is unlikely.
If you do hit the limit, we won't suspended your site, of course. Instead, any visitors that go to your website with 5 simultaneous processes will see an error message, until there are fewer than 5 processes being used on your account.
Thank you,