Once your ABN application is successfully processed, it typically takes about 24-48 hours for your ABN details to be uploaded to the Australian Business Register (ABR) website. This includes the specific ABN lookup feature. If you have selected a future date for your ABN to become active during the application process, your ABN details will not appear on the ABR website until that date. However, you may receive an email confirmation of your ABN registration prior to this date, but it will not be active until the specified start date.