By default all excerpts are capped at 55 words. Utilizing the code below you can override this default settings:
Just copy and paste following codes to yourdomain.com/wp-content/themes/activated-theme/fucntions.php in the most below.
Example:
PHP
function new_excerpt_length($length) {
return 100;
}
add_filter('excerpt_length', 'new_excerpt_length');