What is the deadline to delete ACT scores?

The ACT test has a service where you can delete ACT scores after you have taken the test. Is their a certain period after the test where you can no longer delete your score?

Yeah the period could end in a few hours

I emailed ACT and they said the following, it doesnt sound like there is a deadline.

"To delete your scores for a particular test date, you must submit a written request. Provide us with your name and home address, and we will mail you a form to complete and return to us. We will then permanently remove your record for that test date from our files. All scores from that test date will be deleted.

Write to:

ACT Institutional Services
P.O. Box 168
Iowa City, IA 52243-0168

My daughter sent off the request to address above a couple of weeks ago but hasn’tgotten the form back yet. Anyone have any experience with how long it takes to turn around a request to delete scores?