The trial length is a marketing decision

Almost every free trial is fourteen days, and almost nobody chose fourteen days. It was in the template. It was what the competitor had. It sounded like two weeks, which sounds like enough. Ask a founder why the number is what it is and the honest answer is usually that nobody has ever revisited it, which is strange, because that number quietly decides how many people ever get far enough into your product to see why it was worth paying for.

A trial is not a free sample of time. It is a window, and there is exactly one thing that has to happen inside it: the person has to reach the first moment where your product does the thing they came for. Not log in. Not poke around. Actually finish the one job — the report that tells them something, the first campaign out the door, the thing they would have missed if they had closed the tab. Everything before that moment is setup, and setup is not a reason to pay anyone.

Which means the right length is not a convention at all. It is a function of how long that first real result takes for a normal person doing this alongside their actual job, and normal people do not work on your product for eight straight hours. They open it on Tuesday evening, get stuck, and come back on Sunday. A trial that is technically long enough for a focused user can be far too short for the ones you actually have.

The arithmetic, on paper

Invent some numbers, because the shape is what matters and yours will be different. Say two hundred people start a trial each month. Sixty of them reach the first real result; of those, about forty-five percent become customers, and of the hundred and forty who never got there, maybe two percent do. That is twenty-seven plus three, or thirty customers — fifteen percent of trials.

Now lengthen the trial so it spans two weekends instead of one, and suppose that alone lifts the number who reach the result from sixty to eighty. Nothing else changes: same product, same emails, same conversion rates within each group. You get thirty-six plus two, or thirty-eight. Eight extra customers a month out of a calendar change. Buying those eight through ads at, say, sixty dollars each would cost you about five hundred dollars a month, every month, forever.

Longer is not free

The obvious conclusion — make it sixty days — is wrong, and it is worth being precise about why. A trial length is two things at once: a runway and a deadline. Stretch the runway and you stretch the deadline with it, and the deadline is doing more work than most people credit. Almost nobody evaluates software steadily over thirty days. They ignore it for twenty-seven and then decide in a panic on the last afternoon, which means a longer trial mostly buys you a longer period of being forgotten. It also pushes your cash out by however many days you added, which matters enormously when the company is you.

a trial is not free time, it is a deadline with a product attached

So the target is narrow and specific: long enough that a distracted person can plausibly reach the first result, short enough that the end of it still feels like an event. Roughly twice your median time-to-first-result is a defensible starting place, and it is defensible precisely because it comes from a measurement rather than from what everyone else does.

Measure the thing that is actually moving

Trial-to-paid as a single number will not tell you whether the length is wrong, because it blends two completely different populations. Split it. Count how many trials reach the first real result, how long that takes for the ones who get there, and then convert each group separately. If the people who reach it convert at a healthy rate and the people who do not almost never convert, the length is not really your problem — activation is, and stretching the calendar just gives a stuck person more days to stay stuck. That distinction is the same one we made about the signup is not the finish line: the event you celebrate is rarely the event that predicts revenue.

The other half of this is the silence. Most trials are lost without a word from either side — nobody emails, nobody asks, the window closes. Three messages fix most of it: one when they hit the first result (or when it is clear they have not), one a few days before the end, one on the day. They should reference what the person actually did, not what the template assumed. Drafting those from the trial's real activity is a good use of AI, and a bad thing to let send unattended — an email that says "we noticed you built your first report" to someone who never built one is worse than no email at all.

When somebody asks you to extend their trial, say yes, and then write down the reason. Three people a month asking for the same extra week is not a support pattern, it is your length being wrong by about a week. And resist the reflex to convert a hesitant trial with a discount instead — that swaps a calendar problem for a permanent price problem, which has its own arithmetic, and a worse one.

If you take one thing from this: go and find out how long it takes your last twenty signups to reach their first real result. Not the fast ones, the median. The number you find is the only honest input to a decision you have probably been making by default since the week you launched.