How long does it take for a refund from Apple Store to return?

If your refund is approved, the funds are applied to the same payment method that you used to buy the item.

It might take up to 30 days for the statement to show the refund.

If you don't see the refund after 30 days, contact your financial institution. 

Hello ~ Take a look here:

Check the status of a refund for apps or content that you bought from Apple - Apple Support

~Katana-San~

Correct.

Hello ~ You are welcome and it’s just a waiting period now. You can see in the link I posted that it can indeed take some time. Be patient and have a good one.

~Katana-San~