In most cases, domain name registrations are completed instantly; this relies on the supply of correct information at the time of registration and that your account be in a positive balance to cover the registration fees. Domain registrations may be held up for the following reasons:
If the registration type is .id.au, .asn.au, or .org.au, they require manual review.
If an incorrect ABN/ACN is supplied for a .com.au or .net.au registration.
All other registrations are typically processed within minutes of payment clearing.