Its actually perfectly normal to see it waiting for winrm for hours. Depending on your hardware, 8 might be normalm because its running windows updates and some other long running updates. Unless your packer build is not running headless, you should be able to watch the updates progress in the virtualbox console.
That all said, if you are using the packer template from my packer-templates repo, I don’t think this will get you any further than you got with my virtual box on atlas since the template will create a mirror image of that box.