How to change session expire time in WordPress?

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I want expire the session if user (admin) is inactive for 15 minute in WordPress site,

can anyone tell me what is the default session expiry time in WordPress? and how to change that default expire time.

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  1. Simply add this code in your theme’s functions.php:

    add_filter('auth_cookie_expiration', 'my_expiration_filter', 99, 3);
function my_expiration_filter($seconds, $user_id, $remember){

    //if "remember me" is checked;
    if ( $remember ) {
        //WP defaults to 2 weeks;
        $expiration = 14*24*60*60; //UPDATE HERE;
    } else {
        //WP defaults to 48 hrs/2 days;
        $expiration = 2*24*60*60; //UPDATE HERE;
    }

    //http://en.wikipedia.org/wiki/Year_2038_problem
    if ( PHP_INT_MAX - time() < $expiration ) {
        //Fix to a little bit earlier!
        $expiration =  PHP_INT_MAX - time() - 5;
    }

    return $expiration;
}