Your sign will be delivered via the shipping option that you choose. Generally this is priority mail, and usually this takes 1-3 days, after the completion of your sign.
You can find out more about priority mail (and the other services offered by the USPS, by visiting http://www.usps.com)
That said, it also takes me some time to create your sign! I ask for 4-6 weeks. Believe me I try to get them out a lot quicker than that, but I am a small business, not a large corporation, and as of writing this, I'm the only one working on the signs.
If you have any questions about your order status, or need an expected shipping date, please feel free to contact me at email@example.com