You’re not far off the mark. Many jobs/skills that require intense mental concentration report practitioners needing a rest period or having an upper limit to p

You’re not far off the mark. Many jobs/skills that require intense mental concentration report practitioners needing a rest period or having an upper limit to performance. A notable example I remember are the United Nations’ live interpreters. They can only interpret a live conversation for only about 45 minutes before they have to switch off with a new interpreter because the error rate just exponentially goes up due to mental fatigue.