[2020] Is there any sense to the x-axis labels on the 250 hr productivity graph?

For 10 hours, the scale goes from 0 to 10.

For 50 hours, the scale goes from 0 to 50.

For 250 hours, the scale goes from 0 to 4.2?

So 1 is ~56.52 hours?

But the tick marks are in increments of 0.2, with is ... 11.9 hours?

Am I missing something?

For the 1000 hours graph, the axis goes up to 17.

What?