From where does the 2 hours limitation on bitcoin time stamp come?

From where does the 2 hours limitation on bitcoin time stamp come?

Bitcoin wiki says that:

A timestamp is accepted as valid if it is greater than the median timestamp of previous 11 blocks, and less than the network-adjusted time + 2 hours

My question is why 2 hours? WHy not 1 or 3? Is there any calculation behind it?

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