how late does a same day oath ceremony run?

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My N-400 interview has now been scheduled in Seattle. It appears, from others' cases, that Seattle does, at least some of the time, schedule oath ceremonies on the same day as the interview.

I have a business meeting scheduled for the evening of the same day as the interview, but no business meetings scheduled during the day. The interview is scheduled for first thing in the morning so it is highly unlikely that the interview itself will conflict with my meeting. So my question is how late might I be there at USCIS if they do want to go ahead with an oath the same day?

Would the oath extend into the evening or could I count on it being done by the typical time for closing of a government office (eg 4pm or 5pm, etc)?
 
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