About 3-4 weeks for the new design. But we're still working on new features at the moment. The core-system, like the chart-voting-system, user-mangement (we don't use the Joomla User-Management) or the DJ-promotion-pool functions was programmed in 2008. We only integrated them in the new design. With the Sienna template, we added the news-portal as key-feature to generate more users. And after one week online with the new site: It works!
more than 200% users every day. Next big step is to make the page multilingual.