@peg

Really nice work :) IMO it's fine for folks to run short developments like this. It's all a part of learning and experimentation. Development by committee is no fun for short iterative learning stuff.

Feedback

I think it would be worth showing a table of how the average was calculated. If you take all the close times of each day, then show a table of those values. Which markets make up the average, list the exchanges which have gone into the average.

Other than that I would say it would be neat to have a little day calculator where someone using the service could input the days they worked and it would spit out the calculation and value...

e.g. someone might work 1.5 days in a week...