Code-Snippets-Functions/Execute a function on a child site/All in One SEO Pack/limit-seo-title-tag-output-length.txt-

add_filter( 'aioseo_title', 'aioseo_filter_title' );
function aioseo_filter_title( $title ) {
   if ( strlen($title) > 60 ) {
      $title = substr($title, 0, 60);
   }
   return $title;
}