Apparently it’s 9am on Friday.

If there is an important article that you have been holding back on releasing, posting it on Friday morning at 9am should reach the most readers out of the entire week…

This conclusion was based on an analysis of the logs of the 200,000 visits to the author’s website. The data show that Friday is consistently the day on which most visits are registered. Interesting — but not much good if you’re based in Europe and have readers in other time-zones.