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Actually, I forgot: co-worker/colleague of mine, after he got his I-485 EB3 approval notice/appointment letter (a month or 2 ago), just went over to INS Hartford.. I asked him if he was "interviewed"; Answer: NO.. Took very few minutes.. I particularly checked if he was asked for an employment letter or anything as such.. Nope.. Sounds like Hartford is quite simple and straightforward.. I checked out the very plain stamp on his passport.. [I says, "hey that looks too simple, it\'s fake-able!!"].. Card in the mail in about 10 months..
Answering your question, it is my impression that not much of "processing of I-485" is done in Hartford.
But I wouldn\'t take this as 100% advice, since every case is unique. Hope this helps, it kinda helped me..