The stated length of a service is almost always the length of the work itself, not of the slot. In between come greeting the client, setting up, tidying up and taking payment. That gap is what makes your days run over.
The short answer: measure the time actually taken, preparation and payment included, rather than the time spent on the work itself. Then settle on two or three slot formats, no more.
The work and the slot don’t take the same time
A thirty-minute service doesn’t take thirty minutes. You have to welcome the client, set up, do the work, tidy up, take payment and sometimes book the next appointment.
Putting the length of the work alone into the calendar creates a built-in delay: it starts with the second appointment of the day and never catches up. The clients at the end of the day are the ones who wait, through no fault of their own.
Measure, because estimates get it wrong
Asking how long a service takes gets you an honest answer that is wrong: people answer from the cases they remember, which are the unusual ones.
The calendar keeps a record. The gap between the scheduled time and the payment time, recorded over several weeks and grouped by service, gives you an average and, above all, a spread. A service whose length can double from one time to the next will never fit into a single slot size.
Two or three formats are enough
Once you have measured, the temptation is to give each service its own duration. The calendar then becomes unreadable, and online booking displays a grid nobody scrolls through.
Three formats cover almost everything: a short format, a standard format, and a long format for first visits and complex services.
A service that runs over is often misnamed
When one category consistently exceeds its duration, lengthening it for everyone costs capacity across the whole business.
Most of the time, it combines two situations under one label: a simple job and a job that requires an assessment first. Splitting them gives you two services, two durations, and a calendar that adds up again.
A first appointment is never an ordinary appointment
A first visit includes a conversation, getting to know the need, sometimes an explanation of pricing. It always takes longer.
Giving it its own format keeps that overrun from being paid for by every client that day. It is the most profitable adjustment of all, and the one most often forgotten.
What to avoid
Lengthening every slot to be on the safe side. Capacity drops, the wait for an appointment grows, and the days run over anyway.
Counting on cancellations to catch up. They never come at the right time.
Setting durations once and for all. Your business evolves, and a grid that made sense two years ago no longer does.
What this changes, in practice
Days that end on time, clients who don’t wait, and a real capacity you can finally announce without getting it wrong.
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Frequently asked questions
How do you find out how long a service really takes?
By measuring it instead of estimating it. The gap between the appointment time and the payment time, recorded over several weeks and grouped by service, gives you an average and a spread. The spread is what matters.
Should you include preparation time?
Yes, otherwise the measurement is wrong. What actually fills a slot includes setup, the service itself, tidying up and payment. A service listed at thirty minutes often takes forty-five.
What do you do with a service that always runs over?
Look at it before lengthening it for everyone. A service that consistently runs longer than its stated duration often covers two different situations under a single label.