That definitely sounds wrong. You shouldn't have to wait that long ever.
Do you have Dropbox installed? I've seen a few process dumps with freezes during startup where ti looked like it might be involved, although it is not definite (and is even less definite that it is to blame, even if it was involved). If you do, could you try temporarily uninstalling it?
(You can also disable its shell extension(s) via ShellExView, if you want to avoid unisntalling it.)
If Dropbox isn't installed, or if it doesn't make a difference, could you please generate a process dump the next time you get a similar freeze, and send the result to us? We should then be able to look at it and get a better idea of what Opus is doing and waiting for, and if any 3rd party components might be in the mix.
The Manually generated dumps section of Crash dumps for bug reports explains how to make a process dump using Task Manager.