Hi @jetro157,
I think the second one would be easier to achieve. If you only need to show the duration on the front-end, you can use the count() function on the repeater field. It should be something like this: count(get_field('repeater_field_name')).
If you need to show it on the backend, you can use acf/save_post to update the duration field using update_field(). Maybe something like this:
<?php
function my_acf_save_post( $post_id ) {
$itinerary = get_field('itinerary_field_name');
if ($itinerary){
$duration = count($itinerary);
update_field('duration_field_name', $duration, $post_id);
}
}
// run after ACF saves the $_POST['acf'] data
add_action('acf/save_post', 'my_acf_save_post', 20);
?>
I hope this helps.
