My limited experience with mail sent by "Air" to Europe & Australia has been within a week most of the time. However, a small packet "Air" sent to New Mexico just arrived after 6 weeks. I wouldn't offer surface to overseas. I have found that customers get worried after 10 days, no matter where they are from. Could that be because of the Paypal and eBay "file for non-receipt after 10 days" policy. Why do they have such a policy? It doesn't make any sense. It only creates bad feedback, and unhappy customers when their high expectations are not met.