Here is my experience of same day interview and oath in Seattle.
Interview
My interview was at 9:00 but I left early (6:30) since I live 30 miles away and traffic is a nightmare around there. I was lucky to bypass two bad crashes because I was listening to the radio and got to a Starbucks near there for breakfast.
I got my medicals done in Chennai in early November, thought I would post my experience while it is still fresh in my memory.Note that I am not a Chennai resident - I reached Chennai at 6AM on the test day, and had booked my return the same night. I wanted to finish both the lab and the checkup the same day.
A)Procedure at Lister
I had my N400 interview last week. I passed the English questions without an issue.
Quick background: I was issued 10 year bar and deported in 2005. I had to apply for I601 and I212 (waivers) prior to returning to US. The reason I was deported was because I had overstay after deportation order. I returned to US 2010.