Amazing, thank you!
I have just tried it with two separate articles. One is very popular, but also quite new, so don’t have that much data yet so the test score was down to about 0.81 — the predicted earnings = 0.036 x time — 0.298.
The other article I tried was less popular, but I had a lot more data, and I ended up with a test score of 0.96 and earnings = 0.035 x time + 0.073.
So it seems like it’s quite a good prediction this x0.035–0.038-ish.
This was a fun exercise! It would be nice if one could download the data for the time vs earnings instead of writing it down manually. I save my daily overall earning for all the articles in a spreadsheet, hoping to be able to use it for something later :)