How long would it take to deliver a card to Madrid, Spain using the Cards App for the iPhone?

I want to use the Cards App for the iPhone to send a card to Madrid, Spain for Valentine's day. How long would it take to be delivered, and also, I've got the adress which is an appartment does the app recognize the address the way I have it or is any way the App will mess up in this area.

PLEASE HELP ME!!!