Allows to change up the name of the Distance Rate label for WooCommerce Distance Rate Shipping.

functions.php

<?php // do not copy this line

/**
 * Allows to change up the name of the Distance Rate label for WooCommerce Distance Rate Shipping.
 */
add_filter( 'woocommerce_shipping_method_add_rate_args', 'jp_woocommerce_shipping_method_add_rate_args_2021_01_11', 50, 2 );
function jp_woocommerce_shipping_method_add_rate_args_2021_01_11( $args, $package ) {

	// Check to see if it's a distance rate method.
	if ( false !== strpos( $args['id'], 'distance_rate' ) ) {

		// Get just the time and distance between the parenthesis.
		preg_match('/\(.*\)$/', $args['label'], $matches );
		$args['label'] = $matches[0]; // Contains only distance and time like (10.2 mi; 19 mins)

		// Now we change mi to baby steps, and mins to years.
		// Need to make sure to keep the ; and ) in the search and replace in order to not replace the wrong thing.
		$args['label'] = str_replace( 'mi;', 'baby steps;', $args['label'] );
		$args['label'] = str_replace( 'mins)', 'years)', $args['label'] ); 
	}

	return $args;
}