There's no simple answer in the sense that it depends on what powers you give to that organization, and how much work you demand of it. It can take more time or less time. It really depends on the political oversight and the systems in place.
The other thing we need to keep in mind is that, if we're going to be using four or five organizations looking at this, we need to make sure they're all appropriately funded, so there's no bottleneck in one place while people are waiting in a backlog with other departments. I think that's the bigger question.