Did mine last week for Goa and it took around 30 minutes with all faffing about. You will need to have already scanned in :- A ) page from passport with all your info on and B ) photo (must be square - check size before you start) The good thing nowadays is you can save your progress at certain points and log back in later. Payment is taken in US dollars, paid on credit card and it ended up costing me £60.45 If you get stuck, feel free to contact me and I'll help if I can
This is so much easier than when I went as I had to send a paper application and my passport to the Indian Embassy which took six weeks to return a visa.