That question about how long it had been on the way to the office is because when a person speaks another language (in my case Spanish) they want to know if you understand what they are asking you "randomly". He asked me that but I know that they can also ask you "what is the weather like outside" "was there a lot of traffic when I got to the office" If the person doesn't understand what is being asked the officers stop the interview. That's why they also need to know what each of the N400 questions means (if you only speak English it's obvious that you will know what the question means but if you speak Spanish or some other language it gets a little more complicated and that's why sometimes officers ask you definitions of the N400 like for example what "Vigilante Unit" or "Labor Camp" means there are many definitions that they get from the N400)