[Jugurtha]

Maybe add a hint on what time most people have been on the site, or show a distribution of number of people vs. time.

Bonus if there's an option to change time zone.

Right now, it is 0357 where I am (UTC+1). I'm not sure who visits your site the most, and what time zone they are in.

[Aglartur]

That's a good idea, thanks! I think it will communicate the "busy hours" really well.