My sites are online gaming sites, so definetely work days from 10-3 a byproduct of school hours and workpace lunches
I am fairly steady throughout the day but I tend to see a little boost around lunch time. Fridays are often good for me as well.
THis question actually depends on the website & visitors u have... Since I have alot of entertainment sites my traffic is huge during saturdays & sundays
My best days are Monday through Thursday. Most of my AdSense revenue is from sites targetting business people and they are not researching on weekends or Friday. There is no consistently best time of day for me because my audience is spread fairly evenly hrough all time zones. There is probably a more positive relationship between how much new content I publish and AdSense.
My best day is usually Monday, then it slowly goes down hill for the rest of the week until the next Monday.
For one of my site, best days are Monday and Tuesday. 2 or 3 times more traffic compares to others days of the week. For others sites, it's rather constant.
Suprising my best days have been on Sunday. However, when I get more traffic, I think that will change.
For my main site monday it's the best day of the week, first hours after midnight have the best $/click and week evenings are the best time of day. Weekends are the worst!
The best thing to do is judge your stats at the end of each month. Bitesizing the analysis to days, hours, minutes and seconds just won't do any good.