Time Limited Session

[eluser]saintfalcon[/eluser]
Hi,

I am developing a site with CI and session library.
What I want to make is a time-limited-session.
ex:
User A logged in at 10.20 AM.
User A do nothing until 10.58 AM. --> more than 15 mins of inactivity.
When user A tries to do something, he would be kicked out to login page again.

User B logged in at 10.15 AM.
User B do nothing until 10.25 AM. --> less than 15 mins of inactivity.
When user B tries to do something, it all went normal and inactivity counter reseted back to 15 mins.

I can't seem to make it happen with CI session.
Anyone can help?

Thanks in advance,


Yohan W.