hahah! Many people dont realise that!
I wonder how much time has collectively been spent on this site?
Next thing you'll want is an APP for that, then an APP that shows how long you'll been looking at the APP that ticks off the total time people were logged into BT. Whoever builds it, make sure it has the seconds/minutes/hours/days/weeks/months/years option, along with metric time for the rest of the world.