You can simply use the System Profile Option "POS: Supplier User Account Password Expiration Days" to set the Password Expiration Days to the desired # of days you want.
1. Here's the navigation - Go to System Administrator responsibility > Profile > System > Look for Profile Option "POS: Supplier User Account Password Expiration Days"
2. Upon query, set the profile to the desired level and save your changes.
Thank you for the response. However, I believe this profile is for a normal password expiration. What I need is where you would set the expiration of the password change request from the supplier and an email is sent out to the supplier and they have 3 days to go in and change it. We would like to make it 5 days.