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Does it always take you the same amount of time, or does it depend on the customer?

You'll know whether your business can show an open calendar so customers can book on their own, or whether you need to ask something first.

By Yodai · Published September 6, 2026 · Updated October 13, 2026

You open your business calendar and see two identical slots: one at ten, another at ten thirty. Does that slot work for whoever books it, or does it depend on what they need?

If you cut hair, you barely need to ask. A haircut takes what it takes, no matter who sits in the chair. But if you fix furnaces, things change. One customer tells you it's not heating up and it's a twenty-minute fix. Another says the exact same thing and it's two hours, because you have to replace a part you weren't expecting to touch.

And that's not a small detail. That answer decides how your website should behave the day someone wants to book with you: whether you show them the time slot right away, or whether you stop them for a moment to ask something first.

Before deciding whether your website shows an open calendar so the customer can book on their own, or whether you ask something first, answer this: does your work always take the same amount of time, or does it depend on each customer who walks in?

The name of the service doesn't tell you how much work is involved

Think of five businesses: a hair salon, a tennis lesson, a physical therapist, an auto shop, and a tax prep service. All five might call it an appointment on their website. But underneath, they're nothing alike.

At the hair salon, a haircut is always thirty minutes. At the tennis lesson, the court is booked for a full hour, always the same hour, no matter who's playing. At the auto shop, on the other hand, checking the car could mean changing a bulb or pulling the whole engine. At the tax prep service, a question might get answered in a ten-minute phone call, or stretch to an hour and a half if you have to go through three years of receipts.

The question that matters isn't whether your business looks simple or technical from the outside. It's whether the time you need changes depending on who calls you, or whether it's always the same, no matter who calls. A physical therapist with fixed forty-five-minute sessions falls into the first group, even though the work looks technical. A locksmith who might just open a door or might replace an entire lock falls into the second group, even though the trade looks simple from the street.

This shows up on your website long before the customer pays you anything. If the booking button leads straight to the calendar, you're assuming it doesn't matter who books it. If instead you add a step before that, a question, a dropdown, a couple of options, you're acknowledging that the slot doesn't work the same for everyone.

You don't have to fit entirely into one group

A hair salon might have a fixed duration for a haircut and a variable one for color. An auto shop might have a fixed duration for an oil change and a variable one for everything else. There's nothing wrong with both living side by side in the same business. It even happens at an organization as large as the Mayo Clinic. According to a study from the clinic itself, published in 2024, the visits that work best for self-scheduling are the ones that can be standardized, like screening mammograms or vaccines. Visits for a new symptom, on the other hand, usually need an evaluation before a time slot is set, and thousands of visit types may need someone on the team to step in.

What you can't do is treat the variable part as if it were fixed just because you already have your calendar set up that way for everything else. How to run both types of appointments at once, one business with two calendars, is something we cover later in this course.

If your business runs on fixed duration, you already have the answer: open calendar, the customer books themselves, and the less you ask beforehand, the better. Online shopping shows this with real numbers: in a Baymard Institute study of US online shoppers, after excluding people who were just browsing, 17% abandoned their order because checkout was too long or too complicated. And an open calendar picks up bookings when you're not even working: according to earlier research cited in that same Mayo Clinic study, between 24% and 43% of the appointments patients booked on their own fell outside weekday business hours, depending on the type of visit.

If it's variable duration, you know you can't just leave it wide open. You need to ask something before giving out a time, even if it's just one thing. Exactly what to ask, we'll cover in the next lesson.

And if you decide to leave it open without asking, just for convenience, someone pays the difference: the customer who books right after a slot that ran long. A study from Ruhr University Bochum and University Hospital Bonn, in Germany, worked this out by simulating a family medicine practice: with the same average duration, the more each visit's length varies, the longer patients wait. Their first piece of advice is to separate appointment types by duration and give two slots, or more, to anyone you already know will need extra time. You'll measure exactly what that miscalculated slot costs you in the next lesson.

That gap that doesn't fit has a cost. In the next lesson, you'll calculate it, in hours and in lost clients, to find out whether your schedule is failing because of gaps that are too short or too long.

In Yodai your clients request a time on your site and you confirm it from your dashboard. See how online booking for your business works.