how big value should auth_param basic children be?

[Yong Bong Fong <bfyong@xxxxxxxxxxxxxxx>]

Hi,
  Just wondering how to define the optimum value for auth_param basic 
children. I have around 200+ users utilizing my proxy-ldap 
authentication. Currently i have set it to 20, i wonder if that is 
beyond redundant and what is actually the appropriate value to 
accommodate the users?
thanks

auth_param basic children 50