Different Excerpt Length for Different Post Types https://www.mehulgohil.in/managing-different-excerpt-length-different-post-types/

variable_excerpt_length.php

<?php
/**
 * This function will help to create different excerpt length for different post types.
 *
 */
function mg_variable_excerpt_length( $length ) {
  // Declare $post global variable to detect current post type.
  global $post;
  
  // Check for the type of post type and based on which assign the excerpt length for each post type.
  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', 'mg_variable_excerpt_length');