How long left in current session/cookie for WordPress

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How would I display the current amount of time left of the cookie/session for a logged in user of WordPress? So for example if the cookie timeout is 24 hours and the user has been logged in for 2 hours then the output would be 22 hours.

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  1. WordPress (2.9) stores the log in expiry date (along with other log in details) in a cookie prefixed ‘wordpress_logged_in_’. So, you should be able to do something like the below to display the time until expiry.

    foreach ($_COOKIE as $key => $cookie) {
    if (strpos($key, 'wordpress_logged_in_') === 0) {
        $cookie_array = explode('|', $cookie);
        $expiry_time = $cookie_array[1];
        echo human_time_diff(mktime(), $expiry_time);
        break;
    }
}