The registration process itself will be usually started immediately, since we send it in real time to the responsible registry. In most cases the domain will be officially registered within a few minutes. For some TLDs such as .io (Indian Ocean) or .cx (Christmas Island) the registration may take up to seven days, because the responsible registries are not yet fully automatized.
Should we need further documents for the registration of the Domain, we will contact you via e-mail.
More details can be found on the detail page of the respective TLD. You can find it via the overview of all available top-level domains.