Hey Squeegeeboy. It takes an evening usually, depending on number of flights in a given hour.
I target specific hour of a specific day. And I grab the atc archive for that hour as well, just to have more info.
This way I can try to catch, for example, JFK when they switch patterns to illustrate a different pattern.
(Have not had the will power to go back to new york yet though... too many flights... haha. )
Update: New JFK one. http://imgur.com/ZLLYN.jpg
. Landing on 13L and 22L, take off on 13R. I thought I heard a 22R landing while I was at work but I couldn't hear it again on the archive, if someone knows the procedure for this pattern can you tell me if 22R is used at all please?