How many hours does it take to make a friend?

You have been getting lunch with the same work friend for four months. It is genuinely good — easy conversation, real laughing — and it still does not feel like your college friendships did, the ones where you could call at midnight. You start to wonder if something is wrong with the friendship, or with you. Probably neither. There is a real, measured reason new closeness takes this long, and it has very little to do with how well you are doing it.

Where the number comes from

In 2018 the communication researcher Jeffrey Hall, at the University of Kansas, published a study in the Journal of Social and Personal Relationships that tried to answer the question directly: how many hours of contact does it take for an acquaintance to become a friend? It ran as two separate pieces of research, not one, and the difference between them matters more than either number on its own.

The first surveyed 355 adults who had moved somewhere new in the previous six months, asking them to think of a specific person they had met since the move and estimate, retrospectively, how many hours they had spent together and how close the relationship now felt. The second followed 112 first-year university students, asking them three times over nine weeks to report hours spent with two new acquaintances and how the relationship was changing. One study asks people to remember; the other watches a relationship develop in something closer to real time. Both point the same direction, but the numbers they produce are not identical, and the popular retelling smooths that difference away.

The rounded version, and the messier one underneath it

The figure that circulates in most write-ups is roughly 50 hours to go from acquaintance to casual friend, 90 hours to reach "friend," and 200 or more to reach close or best friend. That is a convenient, quotable average, and it is not wrong so much as flattened.

The study itself splits the two samples apart, and the split is the actually interesting result. The university students needed about 43 hours to move from acquaintance to casual friend; the adults in the relocation sample needed about 94 — more than double. Getting from casual friend to friend took the students roughly 57 more hours; it took the adults roughly 164 more. Reaching a good or best friendship took the students something like another 119 hours on top of that, and the adults needed on the order of 100 more again. Stack it up and the adult sample was still logging well over a hundred hours past the point where the widely quoted "200" supposedly lands. The headline number is not fabricated, but it is a midpoint between two groups whose actual experience of "how long this takes" was quite different — and the group who needed more time was the one made up of adults, not students living in a dorm.

What actually counted as an hour

The type of time mattered as much as the amount. Hours spent on unstructured talk and joking around predicted closeness far more strongly than hours spent simply near each other — working alongside someone, sitting in the same meetings, being in the same group chat, did comparatively little on their own. This lines up with something most people already sense but rarely name: you can log a great many hours in someone's physical or digital vicinity without a single one of them doing the work of making you closer. The hours that count are the ones with nothing else scheduled inside them.

Why this explains the stall, not a failure

Read against your own life, this says something fairly reassuring about the friend you have been having lunch with for four months. If turning an acquaintance into a real friend takes, for an adult, somewhere in the low hundreds of hours of the right kind of unstructured time, then a friendship built on one lunch a month is nowhere near finished at four months — it is only just getting started, and it was never going to feel like a twenty-year friendship on that timeline no matter how well the two of you got along. The stall people feel around month six or eight, the point where they conclude "it just isn't going anywhere" and quietly stop trying, tends to land well before the hours have actually accumulated. It is not evidence the friendship failed. It is evidence that the number is real and adult schedules make it slow to reach.

The part that gets skipped: what this means for the friends you already have

The number is usually used to explain why making new friends is hard, and it does that. What gets less attention is what it implies about the friendships that already exist. If reaching real closeness with a new person costs an adult somewhere north of two hundred hours of unhurried, unstructured contact, then a friendship you already have — one that took years to build, however quiet it has gone recently — is carrying an enormous, already-paid balance that a new friendship would take a very long time to match. That is a large part of why an old friend who has gone quiet for a year is worth the awkward first message far more than the arithmetic of "we have not spoken in so long" suggests. The hours are still banked. Nothing about a quiet stretch spends them.

The honest caveat

Both studies rely on self-report, and self-report about how close you feel to someone is not a precise instrument — people round, misremember, and describe the same friendship differently depending on their mood that day. The design is correlational, not experimental: it can show that more of the right kind of time went along with more closeness, but it cannot fully rule out that people who were already becoming closer simply chose to spend more time together, rather than the time itself doing all the work. And the two samples — recent movers and first-year students — are not everyone; adults with children, adults staying in one place, and adults outside the United States were not what either study measured.

None of that makes the finding useless, but it does mean the specific figure is a rough signpost, not a stopwatch. The point worth keeping is not "log your hours." It is that closeness with a new person is genuinely, structurally slow for an adult, that this is not a personal failing, and that the friendships where the hours are already spent are worth more than a quiet season makes them feel.