I would say around 6k miles is good for the first oil change, that's twice my usual interval for my cars btw, but being a new, low mileage engine, I don't see any harm being caused by leaving the factory oil in there that long. After that I am doing it every 3k miles.
Keep in mind there a lot of variables to take into consideration, type of engine (turbo or NA, ours is turbo of course), driving conditions (traffic or highway), driving manners (if you tend to have a heavy foot) and temperatures in your area. So make your decision based on that.