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Guidance is found on the US State Department site, beginning with the notation that:
Nonimmigrant visa applicants are encouraged to apply at least three months in advance of the intended date of travel.
In Mumbai, the average interview wait time for nonimmigrant visas is 49 days (28 for Student/Exchange Visitor Visas).
Wait Time for Interview
The estimated wait time to receive an interview appointment to apply at a U.S. Embassy or Consulate. (For emergency appointment requests: After checking the wait time where you will apply, if an expedited interview appointment is needed earlier due to an emergent situation, visit the Embassy or Consulate Visa Section website where you will find specific instructions about making the request.)
The visa section of the US Consulate in Mumbai directs you to use www.ustraveldocs.com/in to make, change, or request an expedited appointment.