It is also a fantastic way of knowing where the owner of the site lives and their daily routines. For example, if the site owner is doing maintenance 03:00 GMT, they probably are in Europe. If they are active during only evenings in Americas, they probably live in somewhere in America and has a day job or they study.

So, activity hours and maintenance hours can be used to pinpoint the timezone of the owner and their daily habits. Randomizing every bit of information is important.