How to (form) alter date repeat values?

I want to change the default values of the repeat form, just 1 weeks to 4 weeks and repeat # to repeat 4 times.

So tried hook_form_alter but can't find those settings in my form.

Tried hook_date_combo_process_alter(&$element, &$form_state, $context) which shows the elemement.
But when I do:

$element['rrule']['#default_value'] = 4;

nothing changes.

How to (form) alter the repeat values form?