U.S. Consulate Chennai, India

The process is extremely streamlined and queuing begins exactly 30 mins before your allocated appointment slot. No point going before that. Process is extremely fast once you're inside. Make sure to keep your DS 160 and other key docs upfront. The actual interview queues move pretty fast. Inside the staff guides you according to your visa type to collect payments, fingerprint checks and then the interviews. The staff is generally polite and helpful.