Life / Poland Postcard Delivery Time? [4]

How long does it take in days will my postcard sent from zakopane to arrive in lublin? I sent one to a friend but I think he ignored it. Its been a week already. I just made a move now that I am ready to make peace since we had a falling out years ago. If he ignored it, I think I have to accept he does not want to be friends with me anymore.