It seems like a lot of xF forums I look at have a bunch of members/posts but only a few showing online. Is the default 'cookie clock' set at 10 minutes or so?
Where would I change that timeout globally for a xF site?
a. It's 15 minutes.
b. You can change it in: Admin CP -> Options (under Home tab) -> Users and Registration -> Online Status Timeout (Minutes) at the very bottom of that page.