Interested in taking a gap year in India

So I’m in my first year of university and from the UK, but after I finish my undergraduate I would like to go out and travel India. Not as to stay in luxury holiday parks but as a real adventure and to truly explore.

I’ve looked online and I’ve seen visas for tourists only last for 180 days, so I’m guessing that is the maximum I can stay on my gap year there. I’ve got a general idea of how I want to make my way across the country, starting in the Assam region and then moving down south through Kolkata and Bengaluru and then coming back up north, seeing Goa and Mumbai etc and then going further north to Leh, of course with many other stops on route.

What are people’s personal experiences with travelling across India? And is 180 days more than enough to allow me to visit roughly the entire country?

Interested in taking a gap year in India