It started with a problem.
In the early twentieth century, many manufacturing workers regularly worked ten, twelve, or more hours a day. There was no federal floor on hours in the United States. Employers set terms individually, and competitive pressure often pushed hours up rather than down. The Fair Labor Standards Act, signed by President Roosevelt on June 25, 1938, set a maximum workweek for covered workers. The law established 44 hours in the first year, 42 hours in the second, and 40 hours thereafter. The U.S. Department of Labor's own history records that the 44-hour limit was a compromise after extensive congressional debate, particularly over regional economic differences.
Historical sources below ↓Then something changed.
What made the 40-hour standard stick was not just the legal floor but the overtime requirement attached to it. Employers had to pay at least one and a half times the regular rate for additional hours, which made long hours financially costly for them too. The law also banned child labor in industries covered by the act. Together, these provisions changed the economic calculation of how many people to hire and how many hours each would work. Over decades, 40 hours became a planning assumption for workers, employers, and benefit programs alike — a shared number that made employment expectations legible.
What a builder can learn.
Our interpretation: this is a story about how an informal norm becomes durable only when the cost of departing from it is explicit. Many small-business policies — working hours, response time expectations, approval turnarounds — are informal until a cost is attached to violating them. A delivery window of two days means nothing until a late delivery costs something. The question for a business builder is not just what the standard is but what the incentive structure is that makes the standard self-enforcing.
A door still open.
A hypothesis worth testing: if a small team made one internal standard explicit — say, 'design feedback within two working days' — and tracked compliance, would the act of measuring it change actual behavior even without a formal penalty? Self-measurement sometimes functions like the overtime premium: not a punishment, but a signal that the norm is real and observable.
Which informal expectation in your business depends entirely on goodwill — and what would happen if you made it explicit and measurable?
Follow the evidence.
History is sourced below. Business lessons are editorial interpretations; future possibilities are questions to test, not predictions.
Prepared from primary-source histories. First edition: 25 Sept 2026.