You can work 55 hours a week indefinitely, but after about 8 weeks the loss of per hour production and increases in mistakes will obliterate any advantage that

You can work 55 hours a week indefinitely, but after about 8 weeks the loss of per hour production and increases in mistakes will obliterate any advantage that the extra hours might have conveyed. Don’t underestimate the social value of being busy as compared to actual, measurable outputs. In a lot of high paced environments the former is more important than the latter.