Average number of connections

Hi all,
Does anyone know the average and max number of connections a fairly popular service, like a buisness site, a widely used site, a web service container (forum, poll), and a local service, i.e. blog site, (not a web service, like servlets, but a server service like Jigsaw, or Apache) gets at any one time?
Or just a range, like 50-100, 100-200, 1000-1500, ...

I have read that in apache conf files that maximum value that you can give for maximun simultanious threads is 256 which means an apache instance cant handle morethan 256 requests/hits at a time.
But remember
(One hit per second is equivalent to about 20 users actively browsing, at the rate of a page per minute where a page requires about 3 accesses. If an average user browses for an hour a day, one hit per second thus translates into 100-150 users.)
above part I took from the documentation of Xitami webserver
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