The process is simple but with no control with exact timing.
once a case is approved, NVC will send the information the embassy. Based on the load at the embassy they will determine when the interview will be scheduled and convey the message back to NVC. After interview, it can take 3 weeks to 3 months to get your interview scheduled. Usually it's underb2 months but I've seen it taking 3. NVC does not schedule the interview and is done locally the embassy.
