They will give you a schedule for the interview day in the invitation email. The day starts at 8:30 AM and ends whenever you finish your second interview (you are free to leave straight from there). Staff will escort you to your interviews so there is no need to worry about getting lost, but you do have to find your way back to the office afterward. My first interview went very well and was not difficult at all. He asked me questions that you might expect from a closed file interview (basically information that is in the app file). I didn't mind as it made the interview very low stress. My second interview was much different as he didn't ask me many questions but rather continually asked me if I had any questions for him even after I had asked several. Then he ended it. I didn't know what to think of that.