Appt at 645. Asked only a few questions - where we met, how we met, when we got married, how long I lived where I do and if my wife ever been to the USA. Visa aprovada!!!! Total time took 2hrs!
Advice - bring a copy of your AOS I864, Receipts for AOS & IV Fee and DS 260 completion receipt. Bring a copy of your appt that the embassy emailed you.