I guess it depends on the kind of site and traffic you have but I would recommend at least 1,000 visits. I had 300-400 visits per day when I started my first forum and it still wasn't enough.
Plus you have to remember just because someone signs up for your forum, that doesn't mean they'll post. If you look at the forum statistics at the bottom of websitebabble.com, you'll see the disparity between the number of members and ACTIVE members. There are a lot of people that sign up and never post.
|