How to Hide Timed Content Admin Menus

function plt_hide_timed_content_menus() {
	//Hide the "Timed Content rules" menu.
	remove_menu_page('edit.php?post_type=timed_content_rule');
	//Hide the "Timed Content rules → Timed Content rules" menu.
	remove_submenu_page('edit.php?post_type=timed_content_rule', 'edit.php?post_type=timed_content_rule');
	//Hide the "Timed Content rules → Add new" menu.
	remove_submenu_page('edit.php?post_type=timed_content_rule', 'post-new.php?post_type=timed_content_rule');
}

add_action('admin_menu', 'plt_hide_timed_content_menus', 11);

Where do I put this code?