Session Cache Expire

If Session Cache Expire is not set then it will expire in 180 minutes i.e. 3 hrs

If you want to set it then use the following line:
/* set the cache expire to 30 minutes */
session_cache_expire(30);
Now it will expire after 30 minutes.

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c. 3 hours

By default Session Cache Expire will expire in 180 minutes i.e. 3 hrs

and if u wanna set it then use the lines below:

 session_cache_expire(30);

The above example will set the cache expire to 30 minutes

3 hrs