Probably around 6 or more. Though more active on just a couple then others.
I'm only on this one and a forum for a private music torrent tracker.
Forums are pretty much dead, killed by facebook and reddit.
To update, probably around 6 or 7.
In 5
I've also signed up a couple of forums.
Quite a lot... around 20, I would say
.
Of course, I'm more active on some than on others, and I don't visit each one every day (that would just be insane!)
@
Kyng sounds like you need to setup an RSS reader that filters the forum posts to the ones you're following lol.
Now-a-days just a couple, one being my own of course. hehe
I also active on many forums.