Enterprise Portal - user ID locking after 70 days

Hello,

Forgive me as I'm new to Enterprise Portal, but we currently are using an E Portal which allows use to connect to different applications, including SRM. One of the issues we are having is after 60 days, a user needs to change their password in our system.... However, after 70 days if they havent changed it yet, it completely locks the user out, and they have to call our help desk and go through process to unlock...

Is there a standard approach in which we can prevent the user ID from locking, or at least increase the amount of time it takes? The business wants to go a route with creating a customization to email users after 60 days, but I dont feel thats the best approach as it doesnt really fix the issue...

Thanks