How to keep extending session life when user is active?

Question

Let\'s say there\'s a site/system with a logged in member area, and users are rarely, but very inconveniently logged out while working with the site/system.

It\'s doubt

Answer 1

All the provided answers have shown good insight to the question, but I just have to share the solution to my exact problem. I was finally able to reproduce the problem and fix it.

So the system contained two subsystems, let's say admin and client interfaces. The admin was unexpectedly logged out when they logged in as client in another tab and logged out the client interface while being logged in as admin. It was doing this because everything was written to one session with namespaces. What I did is remove the code that kept destroying the session on logout action, and replaced it with session namespace unsetting and replacing with guest session for that namespace that only has access to the login page.