Processing time for F1 dropbox visa

Hey guys! I am applying for F1 visa via Interview waiver. I have an appointment on June 30th at the Hyderabad VAC, but will be dropping documents at Mumbai VAC.

  1. Is the stamping process slower in Hyd?
  2. Will dropping documents at Mumbai add transit time?
  3. How long will it take to hear back from Hyd consulate?
  4. If I were asked to opt for an interview, will that happen in Hyd or Mumbai?