More than 200 hours of hanging out, talking, and doing ordinary things together before someone starts to look less like a regular friend and more like a close one. That figure stopped me when I first came across it — not a metaphor but an actual budget of time you have to spend with another human being before they cross over into the category of close friend.

I am not a psychologist, and this is one researcher’s reading of his own data, not a law of nature. Take it as something to think about, not a rule to live by.

What Hall actually tracked

The number comes from Jeffrey Hall, a professor of communication studies at the University of Kansas, who put friendship formation into hours. He ran two studies. One asked 355 adults who had recently moved somewhere new about the time they were spending with people they had just met. The other followed 112 first-year students over nine weeks as they got to know new acquaintances.

Out of all that came a rounded headline set of numbers. About 50 hours to move from acquaintance to casual friend. Around 90 hours to reach plain old “friend.” And more than 200 hours before someone counts as a close friend. The hours that mattered most were leisure hours — hanging out, joking around, gaming, talking — not merely logging time beside someone at work or in class.

Those round numbers of course are a simplification: the underlying paper reports the adult sample moving more slowly than the students, so think of them as the press-release version of a more granular finding.

There is a quieter figure in there too, and it is the one I keep returning to. The people who never made it past acquaintance had typically spent no more than 30 hours together. So the gap between “person I sort of know” and “person I would call when something goes wrong” is not purely a personality difference or a chemistry thing. It is, at least partly, hours that never got spent.

Why the hours feel so hard to find

This is where it stopped being abstract for me. I lived in Vietnam for years, and in my first year I made a lot of friends. There was a big group of us, and I would see them almost every week. It felt easy, the way it does when everyone is new and everyone has time.

By year five, I was down to about five friends I would actually meet up with.

The group did not fall apart because of any falling out. People in an expat town move. They take a job somewhere else, their visa changes, they go home, they drift toward whoever is geographically convenient that season. I found it genuinely hard to make and keep friends, and a lot of that was structural. The hours never get a chance to accumulate, because the person you were accumulating them with leaves before you reach 200.

Looking at Hall’s staircase, that collapse makes a grim kind of sense. A big year-one group at, say, 50 or 60 hours each is a pile of casual friends. Casual friends are exactly the ones who evaporate when life nudges them, because the bond was real but thin. The five who stayed are probably the ones I happened to clear 200 hours with before anyone moved.

Hall noticed something about how those hours land, too. He found that when people moved up a stage, “they’ll double or triple the amount of time they spend with that other person in three weeks’ time.” That was true in his sample of students, not a guarantee for everyone, but it fits what I have watched happen. Friendship does not creep up evenly. It tends to come in bursts, a run of weekends or a stretch where you suddenly see someone constantly. A mobile life keeps interrupting exactly the kind of bursts the staircase relies on.

What to do with this

The reframe I have taken from this is less a tactic and more a correction. I used to half-believe that close friendship was something that happened to you, that you either clicked with someone or you didn’t. Hall’s numbers push against that. As he puts it, “We have to put that time in. You can’t snap your fingers and make a friend.”

That sounds obvious until you notice how rarely we act on it. Hall’s point is blunt: “these relationships are not going to develop just by wanting them. You have to prioritize time with people.” Wanting more friends and doing nothing differently is the default state for a lot of adults, myself very much included. The hours do not turn up on their own.

The practical version, if there is one, is unglamorous. You cannot manufacture a close friend. You can only repeatedly choose the lower-stakes version: the second coffee, the standing dinner, the invitation you almost did not send.

If the friendship side of life feels heavier than interesting right now, if it tips toward loneliness, that is worth taking to a qualified counsellor or therapist rather than carrying alone.

That is the part I have made my peace with, slowly. What stands between an acquaintance and a friend isn’t some spark I lack — it’s hours, the ordinary kind, often the unphotogenic afternoons where nothing happens except that you were both there.