Some areas have been designated as protected or restricted zones and special permits may be required. At the moment, the following states may be subject to such restrictions: Andaman & Nicobar Islands, Arunachal Pradesh, borders areas of Jammu and Kashmir, Manipur, Meghalaya, Sikkim and the Union Territory of Laccadives Island. You should check with the Indian Embassy before you travel.
Visa applications can usually be processed on the same day, although this may well differ in other countries throughout the world. For postal applications, you should give 15 working days to be sure. You should also make sure your passport is valid for at least an additional six months from your date of entry into India.