WordPress at a glance
filter is not described

comment_cookie_lifetime filter-hook . WP 2.8.0

Filters the lifetime of the comment cookie in seconds.

Usage

add_filter( 'comment_cookie_lifetime', 'filter_function_name_2933' );
function filter_function_name_2933( $seconds ){
	// filter...

	return $seconds;
}
$seconds(int)
Comment cookie lifetime.
Default: 30000000

Where the hook is called

wp_set_comment_cookies()
wp-includes/comment.php 543
$comment_cookie_lifetime = time() + apply_filters( 'comment_cookie_lifetime', 30000000 );

Where the hook is used (in WP core)

Does not used.