Only the applicant is allowed in, we arrived 30 minutes prior and my husband (the applicant) was let in immediately. He had to surrender his phone and they gave him a coat check # for it. He went through security and he checked in and they gave him a #. He sat and waited to hear his # called over intercom and went to the corresponding window and gave all the documentation that was required in the interview letter. Remember to bring the original letter. He waited in that room for 40 minutes or so and then got called to a different room where the officer questioned him for a good 20 minutes: how we met, when we married, where we work, about my previous relationship, specific timeline information (and they did not want him referring to his documents for answers), after that it was approved and that was that. Took about 1 hour 40 minutes total. We got notice that the passport was ready for pickup within 3 business days.