It takes a month, mostly to get your transcripts. Even though the Online Transcripts methods of Anna University have been in place for more than a year, they still refer to it as a Pilot process that just officially started. The process takes between 15 and 30 days, depending on the importance assigned by the authorities. So, always be cautious and apply at least three months in advance so that you can remain calm.
However, courier fees are quite high. India Post accepts international shipments and is less expensive than DHL and FedEx. It is preferable to visit the Controller of Examinations' office rather than apply online. However, this method is best suited for outstation students, particularly those from Tamil Nadu or any Southern states.