How to test if email address are added to UserLists in AdWords API using C#.

I am using a CRMBasedUserList, to which i add the email address in my database. But, i came to know that AdWords API does not show exact count of email address it has in a UserList. Also, approximately how much time it will take to update a list of users to Email List?
Is there any way to test, if all the email address are added successfully or some of them failed...?

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