functions.php

/**
 * Multi excerpt_length
 */
function vts_variable_excerpt_length( $length ) {
  global $post;
  
  if ( 'post' === $post->post_type ) {
    return 32;
  } else if ( 'page' === $post->post_type ) {
    return 65;
  } else if ( 'products' === $post->post_type ) {
    return 75;
  } else {
    return 80;
  }
}
add_filter( 'excerpt_length', 'vts_variable_excerpt_length');