score:5
All the details are stated on this page from the US Departement of State.
The procedure involves applying online then going through an interview.
The same page also has a form at the bottom which allows you to find out waiting times. I looked up Mumbai and New Delhi and both had waiting times of over a year.
You will probably need to find some other routing. Note that if you opt to connect through and airport in the Schengen Area instead, you may need an Airport Transit Visa from the relevant country (this depends on the country where you transit).