There can be three reasons why it doesn't.
1. We always try to make the best t-shirt possible and sometimes that ambition makes the t-shirt a couple of days late.
2. We've seen that sometimes people have suffered up to a ten day delay due to slow handling at the borders. We're really sorry about that if it happens, but we're afraid it's out of our hands. Just be patient and the t-shirt will come.
3. It can be that we need to get the printing to be just perfect or that the packaging needs an extra day. In the end, the few days wait is well worth it.