Change excerpt length depending of the category

Ever wished to modify the excerpt length based on which category you are on? Here comes the code which grants your wish. Simply paste the code into your functions.php file, and 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;
    }
}