Checked the website in german if I understand correctly it says that the delivery time is 30 working days so you could be waiting for even a little longer.
Does Dhl Deliver On Saturday Provide Accurate Estimated Delivery Date On Your Woocommerce Store Elextensions Parcels and pallets sent to the Netherlands Belgium and Luxembourg will be delivered the next workday.
In most cases, it takes them 4 to 5 days to deliver an international package.