I think it is. Narita is the location of a major temple, and wandering around the temple to look at everything could take 90 minutes. The way you get there is to take either the Keisei or the JR East trains to Narita and walk up the road (sorry, you're going to have to ask for directions) to get to the temple; call it a 15 minute walk. BTW the road to the temple is filled with little shops that can take an hour or more to check out. (Narita city runs a tourist information center on that road that has got free internet, if that matters.) The other place I found interesting is the Aeon shopping center - there's a large second hand place that's part of the mall that sells lots of clothing, some hard goods and CD's/DVD's. The things they sell are clean and look reasonably new. I spent an hours walking the aisles here. BTW these two places are pretty far apart; the train station is sort of in the middle. You can make both in your nine hour timeframe, but if you were to choose one over the other I'd choose the temple for being local and also because you can walk to it from the train station (you need a bus or a cab to get to Aeon).

Check the Japan forum to see if there's any other comments, I'm sure there must be some.