For naturalized citizens: how long after interview did you get an appointment letter for the oath?

[Anonymous]

Hello,

I went to the naturalization interview two weeks ago in VA and the immigration officer told me that since I lived in DC I had to wait to get a appointment/letter in the mail for the oath ceremony. Has anybody gone through this process on this board? How long did you wait? I am in no particular hurry, the thing is that there have been some problems with mail being delivered properly where I live and I get paranoid about not getting the letter.
TIA