By default, excerpt length is set to 55 words. To change excerpt length using excerpt_length filter, you need to add a dew code to your functions.php file in your theme. You can modify the excerpt length based on which category you are on, without modifying your theme files.

You don’ have to modify your theme files. Simply paste the code into your functions.php file. Don’t forget to change the category ID on line 3!

add_filter('excerpt_length', 'my_excerpt_length');
function my_excerpt_length($length) {
if(in_category(14)) {
return 13;
} else {
return 60;
}
}

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