I got a non-tourist e-Visa about 6-7 months ago, it was approved in less than 15 hours. I've had several ETVs before, all of them were approved within 24 hours
Process is very easy, just don't be retarded and read the rules thoroughly: your uploaded passport pages must be in PDF format, pcture has to be a certain size, etc. it's not rocket science but a lot of people make mistakes.
IIRC costs are reciprocal, so Americans pay the most. However, visa durations are also reciprocal, which means Burgers are literally the only nationality that can get a 5-year multiple-entry e-Tourist visa (everyone else is 30/90/180/365 days, I think Japs or Brits might also be entitled to the 5 years but not sure). Costs something like $75-$100, don't do it anywhere except the official e-Visa website.
Also, print off a copy of your ETV and the latest COVID entry rules. I flew back to India a while ago, fucking moron at the airline counter kept trying to tell me that Americans aren't allowed to enter India on e-Visas anymore (unrestricted eTVs were restored for literally every nationality a few months ago) >>2241938
Just go stay in Central or South Delhi (Safdarjung, Hauz Khas, Saket, GK-I/GK-II, etc). It's still India, but there are a LOT of upper-middle-class neighborhoods full of people who probably make way more money than you.
but imo Delhi is pretty conservative so far as India's big cities go, if you want to party then Mumbai and Bangalore are both better in my opinion. Delhi doesn't really have the same 24/7, always-working culture as Mumbai, for instance, and most of the city is pretty dead after about 11pm. The nightlife in traditional nightlife areas like Hauz Khas is pretty shit nowadays, I think a lot of it has migrated to Aerocity, Noida/Gurgaon, etc, but I actively avoid Delhi nowadays. I have a lot of friends there but the city is just horribly polluted and the people are way less chill than elsewhere