That's a good one. I never analyzed the days of the week before.
Here is a 7 month old post about the time of the day: https://steemit.com/steemit/@penguinpablo/at-what-time-of-the-day-are-the-most-steemians-online. Maybe I should give these stats an update as well.
That would be really interesting! I have a feeling that some topics earn a lot more during certain times, so it would be interesting to see more analyzes of the different times of day/week.