\On May 8, 2018, at 4:23 AM, Eero Volotinen <eero.volotinen@iki.fi> wrote:

We are using pam + google authenticator to authenticate our users. How to implement 90 day inactivity user lockout?

Use a database. Write the last login to a database. When a user is logging in, check the database.

This must be very stupid question, but still asking.. as I didn't way to way to implement this. tried pam_lastlog on /etc/pam.d/radiusd, but I didn't worked..

This is an unusual configuration. There is no pre-packaged solution which does what you want. You will have to configure it yourself. Alan DeKok.