Limit Excerpt Length in WordPress

function set_excerpt_length() {
    return 20;  // Sets the automatic excerpt length to 40 words
}
add_filter('excerpt_length', 'set_excerpt_length');

function new_excerpt_more($more) {
    return '...';  // Change to whatever you want the 'read more' text to be.
}
add_filter('excerpt_more', 'new_excerpt_more');

Here’s how to use it:

echo wp_kses_post(get_the_excerpt());