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It sounds like your 1 week task has been assigned to a resource which is working at 66% availability, which means the task will be 1w 2.576d in duration.

The effort/duration distinction can be confusing at first; I know I had to play around with it quite a bit to get any comfort level established, and as I recall the sample files available on the website and used in the tutorials don't really touch on this. Rereading the manual around page 48 or so (at least in the online copy) might help. Can you post a simple example of your problem?