How to change thumbnails cache policy?

Hi Frank,

I’ve just found a new error on PageSpeed Insights. It’s about a cache lifetime of thumbnails stored locally. It appears to be set to 7 days. I would like to change this value to at least 30 days, although I don’t know if it doesn’t have to be set to 6 months for this error to disappear.

I found this code in lyteCache.php, but I don’t know how to modify it. Is it enough to change “7” to any value? Could you help? ??

 // send all sorts of headers
        if ( ! defined( 'LYTE_CACHE_EXPIRE_TIME' ) ) {
            $expireTime = 60 * 60 * 24 * 7; // 1w
        } else {
            $expireTime = LYTE_CACHE_EXPIRE_TIME;
        }
        header( 'Content-Length: '. strlen( $thumbContents) );
        header( 'Cache-Control: max-age=' . $expireTime . ', public, immutable' );
        header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expireTime ).' GMT' );
        header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', $modTime ) . ' GMT' );
        header( 'Content-Type: ' . $contentType );
        echo $thumbContents;

Best,

Adrian

The page I need help with: [log in to see the link]