500 or more. I've tested this one with my old account. I made 2 hubs concentrating on the same keyword. The other one has about 300 words while the other one is above 600. Their traffic was about the same during the first week, about 30 views per day...However, the longer hub improved the week after and is now having an average view of 50 per day while the other barely makes 10 a day. With this new account, I decided to create hubs with more than 1000 words and it's looking good. Got 10k overall views in less a month and already earned about $30. Good luck!