hook (filter): Filter the number of seconds to cache a specific podcast URL for. The returned value will be ignored if it is null or not a valid integer.<p>Note that this timeout will only work if the site is using the default <code>WP_Feed_Cache_Transient</code> cache implementation for RSS feeds, or their cache implementation relies on the <code>wp_feed_cache_transient_lifetime</code> filter.</p>

