Risker, 26/06/2012 03:55:
There are sometimes good reasons for holding office hours consistently at a specific time, most particularly if there is a desire to draw in editors from a certain geographic area, or if that is the time that a specific language group finds most convenient. [...]
Don't forget the efficiency of calendarization [does this word even exist in English?]: it's way easier to organize yourself if the date and time is always the same. Of course this doesn't help if you're constantly busy at work or asleep at that time. ;)
Nemo