First and foremost, you must wait until the last date for admission to that cycle has passed. Following that, you should receive confirmation within two to three weeks. After confirmation, you will receive a message on your registered phone number and via email.
After submitting the required documents, the mail regarding admission acceptance is received within an hour.
People at each IGNOU regional center are extremely helpful. When contacted, the concerned individual reviewed my brother's form and provided details regarding discrepancies as well as a solution.
Overall, it is a quick procedure, and if you have not received your confirmation, please contact your regional center.