If everyone used the site at different times? I assume you mean different times of the day, so that everyone in the world uses this site everyday.
I don't know what the capacity or bandwidth of this site is, but I'll take a guess and say this site could handle 5,000 people on it at one time, assuming everyone is sticking to the normal ratio of time reading vs time actually posting.
The world population is now 7.4 Billion, or 7,400,000,000 people. If everyone in the world used this site sometime during the day, and they all got together to come in at agreed on times, then assuming equal time for all, (A2K wouldn't have it any other way), each person would be allowed to be on here for 5,000 / 7,400,000,000
of a day.
Or 1 / 1,480,000 of a day.
Or 1 / 61,666.6666 of an hour.
Or 1 / 1,027 of a minute.
Or 1 /17 of a second.
So the answer is, unless everyone in the world learns how to read and write really fast, they can't use this site for a certain period of time everyday.
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