How Can I Extend Session Time

[eluser]mTuran[/eluser]
i know but if i increase that time session table will be more bigger. Actually i want session not expire while visitor browsing my site but that way(increasing expire time) is most true option i will use that.

Or if my login way wrong what is the true way ? have i to store id variable to anywhere like native PHP session ? I am searching what is the best and true way for do that ? Thanks.