Your webshop is online at the same time you create it
After you've create it, take some time to complete the webshop. For example, you must enter your contact information and create your items.
Your webshop can be ready in as little as 30-90, if you only have a few items.
If you want to use your own domain name, you should allow 1-2 days before it has been moved or registered.
If you wish to accept Dankort, Visa, Mastercard, etc. you should also allow some days to be approved for it.