Quite similarly, I imagine that if there were a chart sort of like like Figure 1 with "mental health" on the y-axis but having "total work hours per week" on th

Quite similarly, I imagine that if there were a chart sort of like like Figure 1 with "mental health" on the y-axis but having "total work hours per week" on the x-axis, there'd be a peak somewhere above zero hours but far less than 40 hours. (Controlling for same type of work, sames ages, etc.) Anyone want to guess what the peak x-axis value would be?