ADDS 2012/R2 sizing and limits

Hi guys, I've a few doubts about sizing ADDS when what matters is limits por example

A customer has an amount of 10.000.000 users on their LDAP database and they have 6000 simultaneous authentication proccess during a period as describerd below. 

(oracle database)--<>--WEB-SYSTEM  <---------<ADDS-auth>-----------<-------customer-employee(authentication)

They had tried a lot of LDAP solutions to keep it running and now we have the chance with ADDS to improve it.

What do you have to say about it? how to size this solution?

here what we have found

https://technet.microsoft.com/en-us/library/cc753439(v=ws.10).aspx
https://technet.microsoft.com/en-us/library/cc753439(v=ws.10).aspx
http://social.technet.microsoft.com/wiki/contents/articles/14355.capacity-planning-for-active-directory-domain-services.aspx#Evaluating_Current_Capacity_Consumed
http://blogs.technet.com/b/qzaidi/archive/2010/09/02/override-the-hardcoded-ldap-query-limits-introduced-in-windows-server-2008-and-windows-server-2008-r2.aspx

https://technet.microsoft.com/pt-br/library/active-directory-maximum-limits-scalability(v=ws.10).aspx
http://www.microsoftnow.com/2008/10/increasing-number-of-objects-returned.html

thanks in advance,

Thiago

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