There is no single delivery time that accurately describes every TEMU order sent to Spain.
TEMU's Spanish terms state that customers can see an approximate delivery date and choose from the available shipping methods before submitting an order. Shipping and delivery are generally handled by logistics providers, unless a seller fulfils the order itself.
For that reason, the estimate displayed for the actual Spanish postcode should take priority over a generic delivery range published on a coupon site.
TEMU's Spanish website currently promotes free shipping, but exclusions can apply and the shipping cost shown in the basket should always be checked before payment.
Once the parcel has been dispatched, the most reliable delivery information is found in the order tracking area. It shows the progress of that particular shipment and, when available, the logistics provider handling it.
I would not assume that every Spanish TEMU order is delivered by Correos, SEUR, CTT, MRW or another particular carrier unless the carrier is actually assigned to the shipment. TEMU's Spanish terms do not designate one nationwide courier for all orders.