I work at DOJ and have been part of the hiring committee in my office. We have done same-day second round interviews for out-of-town candidates (especially those coming from the west coast) as a courtesy so that they do not have to pay to fly back. For more local candidates (or even people within a couple hours of flying time), the time between first and second round interviews can be weeks. Also, at least in my office, they like to interview all of the potential candidates before making offers. So if you were early in the process, you may have completed your interviews on the same day....but you may not hear one way or another for awhile because it could take us some time to do first and second round interviews for all the other candidates and then for management to sit down and decide to whom to extend offers.
During our most recent hiring round, it was something like four months from the time we did our first first-round interview to when we made our first offer (we were hiring for several spots simultaneously).
However, I also think hiring timeframe can vary dramatically by office based on what I have heard anecdotally.
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