Just completed interview at Newark (14th june).
My interview time was scheduled at 9:30 but there was a long line. Actual interview took place at 1:15.
I counted 3 oaths - one in the morning, one around 1:30 (right after my interview) and 3:30.
I had to wait until 3:30 - they weren't able to print out my certificate quick enough after the interview to get 1:30.
Overall glad I could complete everything same day even though the wait time took around 6hrs.