Considering what alot of the posts on here are though you could easily knock out 1 a minute, especially seeing as alot of the time people don't seem to read the whole thread their posting in.
That's less than 1 hour a day, which I think for quite a few people is also the time when they should be doing work and are trying to pass the hours, although I may be wrong there.
<Edit> I only make about 1.1 posts a day... that either makes me very unconstructive or means I actually have a life. I'm leaning towards the first one tbh =) </Edit>