How long does it take to build an installer for Windows? 24 hours is a bit ridiculous!
Unfortunately, sometimes the UI fails to update - try refreshing the page.
Rarely, a process may get stuck, which sounds like might have happened to your installer creation. In this case, you can try resetting the process by making a minor change to your configuration. For example, changing the version of an existing package, adding a new package, changing the version of the language, etc.
Hope that helps,