If you have all the required documents and information, the registration will be completed there and then, and you will also receive the registration number straight away. The registration certificate will be mailed to you in about two weeks.
You may, however, use your watercraft already before the registration certificate reaches you. However, remember to attach the registration number to the craft as instructed. If necessary, the authorities can check the system to see that the watercraft has been registered and that the certificate is being issued. It is, however, a good idea to always keep the bill of sale in the watercraft when using it.