I agree with the comments that have been made. Having a blackout period really prevents the registration, the accounting and the payment of duties and taxes. It really causes a lot of havoc, even in billing customers.
One of the issues you can see is that customers expect the duties and tax bills during a certain period of time. They may have year-end accounting at that point in time. The billing will not occur for duties and taxes because the entries won't be filed with Customs.
It's a very long period to have absolutely no activity and no ability to register.