Dolly Parton taught us all how to feel about the working world before most of us ever had a job.

“Workin’ 9 to 5, what a way to make a livin’.”

Eight hours a day. Five days a week. Put in your time, collect your check, and do it all again Monday.

We don’t even have to think about it. Everybody knows what a normal workweek looks like.

Except nobody ever asks why.

If you have a full-time job, there’s a decent chance it adds up to roughly 40 hours a week. Most of us never question it. It’s just what full-time means, the same way a dozen means twelve and a foot means twelve inches.

Except it isn’t the same.

A dozen and a foot are fixed by definition. The 40-hour workweek is not a law of nature. It is a social arrangement – one created by people, debated by people, fought over by people, and eventually accepted by people as normal.

That last part is important.

Normal things have a way of disguising themselves as natural things.

When factory work expanded in the 1800s, many laborers worked far longer than 40 hours a week. Ten-, twelve-, and even thirteen-hour days were common in some industries, often six days a week. Children worked long hours alongside adults, sometimes in conditions that would be unthinkable today.

There was no obvious natural limit, because the people with the power to decide had different incentives. Longer hours meant more output, more production, and more use of expensive equipment. From where factory owners sat, longer days could look perfectly rational.

It took generations of organizing, strikes, pressure, and lawmaking to move toward the work schedule many of us now take for granted. Henry Ford helped popularize the five-day, 40-hour workweek in 1926, not entirely out of generosity, but because shorter hours could also serve business interests. Rested workers were more productive. Exhausted workers made mistakes. A little more leisure could also mean a little more spending.

Eventually, federal law moved in the same direction. The Fair Labor Standards Act of 1938 established national wage-and-hour protections and helped make the 40-hour week the standard line after which many workers must receive overtime pay.

Here’s the part worth sitting with: nothing about human biology determined that number.

Forty hours was not discovered in nature. It was not calculated once and for all as the perfect balance between productivity, family life, rest, health, and community. It was a political and economic compromise reached in a particular country, at a particular moment, between particular interests.

And yet most of us treat it as though it came from somewhere above negotiation.

We don’t ask whether 40 is right. We ask whether someone is working “enough,” using 40 as the unquestioned baseline for what enough even means.

This matters for a reason that has nothing to do with whether you personally think the workweek should be shorter, longer, or exactly the same. Reasonable people can disagree about that. The issue is the habit of mind.

We tend to assume that whatever arrangement we grew up with is simply how things are, rather than one choice among many that people made for reasons at a particular point in time. Once something settles into “normal,” it stops looking like a decision at all.

The same thing happens elsewhere; we just don’t notice it as often.

The five-day school week. Summer break. The age at which children start kindergarten. Retirement around 65. The way neighborhoods are designed. The way health insurance is tied to employment. The hours when courts, banks, and public offices are open.

None of these are facts about the universe.

They are inherited arrangements. People created them. People defended them. People adjusted to them. Eventually, they began to feel as fixed as the length of a foot.

That does not mean they are all bad. Some arrangements last because they work well enough. Others last because changing them would be difficult. Still others last because people stopped asking questions.

But “normal” and “natural” are not the same thing.

Natural means it had to be that way.

Normal means we got used to it.

The difference matters because arrangements made by people can be reconsidered by people. That does not mean every inherited practice should be torn down or replaced. It means we should occasionally ask whether the reasons that created something still make sense for the world we actually live in now.

The 40-hour workweek was the answer people landed on nearly a century ago, in a different economy, for different jobs, under different assumptions about how work and life fit together.

It might still be the right answer.

But it is worth remembering that it is an answer, not a fact.

And if somebody had to decide it, then somebody is allowed to ask whether it still makes sense.

Dr. Raymond E. Barranco is professor of sociology at Mississippi State University. He earned his Ph.D. in Sociology from Louisiana State University, and his work has been published in multiple criminology and sociology journals. Dr. Barranco invites readers to send feedback and sociology-related questions you’d like him to address in this space to [email protected].