This doesn't equal out to 2.5 billion people a day. One requests does not equal a unique visitor. For most cases that doesn't even equal one page load. I don't know where the 29k/s number came from but I guess its a peak load from one of these bench marks. It isn't realistic to expect a server to be consistently pegged at 100% 24 hrs a day. The real number is going to be a tiny fraction of that