The lead time (also "advance time" or "minimum booking notice") is the minimum time between the moment of booking and the earliest possible appointment. It defines how far in advance a customer must book at the very least. The lead time gives the operator enough time for preparation, planning and organization and prevents bookings at too short notice, which are logistically difficult to handle.
Example: With a lead time of 24 hours, a customer booking on Monday at 10:00 am can book an appointment on Tuesday at 10:00 am at the earliest, or later. All time slots between Monday 10:00 am and Tuesday 10:00 am cannot be booked by them.
Use cases
1. Preparation time required
A photographer needs a lead time of 48 hours to prepare equipment, scout locations and get ready for the shoot.
2. Ordering materials
A tradesperson needs a lead time of 3 days to order the required materials and plan the trip.
3. Planning certainty
A consultant does not want to be caught off guard at short notice and sets a lead time of 24 hours to prepare for the meeting.
4. Staff planning
A clinic with several doctors needs a lead time of 48 hours to coordinate duty rosters and make sure the right specialist is available.
5. Lab tests or external service providers
A diagnostic center needs a lead time of 72 hours because certain tests are only carried out at certain times and lab samples have to be prepared.
Technical implementation
The lead time is configured in the calendar or per appointment reason. The system automatically calculates which time slots are visible to the customer:
- Current time: Monday, 10:00 am
- Configured lead time: 24 hours
- Earliest bookable appointment: Tuesday, 10:00 am or later
All slots before Tuesday 10:00 am are hidden or marked as "not available".
Different lead times per appointment reason
It often makes sense to define different lead times for different services:
- Standard consultation: 24 hours lead time
- Emergency appointment: No lead time (immediate booking possible)
- Complex treatment: 72 hours lead time (more preparation needed)
Short-notice exception: "short notice" mode
An optional setting (advance_time_open_short_notice) makes it possible to still allow very short-notice bookings, even if they would actually fall within the lead time. Typical scenario:
- Configured lead time: 24 hours (to ensure planning certainty)
- Short notice rule: If less than 2 hours remain until the appointment and the slot is still free, the customer may book anyway
Why does this make sense?
- On the one hand, the operator wants 24 hours of lead time for normal planning
- On the other hand, if a slot is free in 1 hour and the operator is there anyway, the slot can still be filled (last-minute booking)
- Prevents free slots from going unused even though there is short-notice demand
Example with the short notice exception
- Monday, 10:00 am: A customer wants to book
- Lead time: 24 hours
- Normally not bookable: Monday 10:00 am to Tuesday 10:00 am
- But: Monday 11:30 am is a free slot (only 1.5 hours away)
- Short notice rule: slots < 2 hours away may be booked
- Result: Monday 11:30 am can be booked even though it is within the 24-hour lead time
Benefits of lead time
- Predictability: Operators have enough time to prepare
- Less stress: No hectic last-minute appointments
- Quality assurance: Enough time for thorough preparation increases service quality
- Fewer no-shows: Short-notice bookings are forgotten more often; a longer lead time means more time for reminders
Drawbacks
- Less flexibility for customers: Spontaneous bookings are not possible
- Unused capacity: Free slots that would still be available at short notice cannot be filled (except with the short notice rule)
Best practices
- Choose what is usual in your industry: 24 hours for services, 48-72 hours for more complex appointments
- Observe customer behavior: If many customers want to book at short notice, reduce the lead time or enable short notice
- Communication: State it transparently on the booking page: "Appointments can be booked up to 24 hours in advance"
- Allow exceptions: Still accept short-notice bookings by phone (manually by the operator)
Combination with other parameters
- Maximum booking horizon: How far into the future can customers book? (e.g. a maximum of 3 months in advance)
- Cancellation deadline: Until when can an appointment be canceled? (often identical to the lead time)
- Rescheduling deadline: Until when can an appointment be rescheduled?
Example of a complete configuration
- Lead time: 24 hours (minimum interval before the appointment)
- Maximum booking horizon: 90 days (the customer can book a maximum of 3 months in advance)
- Cancellation deadline: 24 hours (free cancellation up to 24 hours in advance)
- Short notice rule: Active (slots < 2 hours away can still be booked)
Legal aspects
The lead time is not a legal requirement but an organizational decision. It should, however, be communicated in the terms and conditions so that customers know what to expect.
Industry-specific differences
- Doctors: Often 24-48 hours lead time, emergency appointments by phone
- Hair salons: Often only 2-4 hours lead time (high flexibility)
- Consultants/coaches: 24-72 hours (preparation is important)
- Tradespeople: 3-7 days (ordering materials, planning)
- Restaurants: Often no lead time (spontaneous reservations possible)
- Events/workshops: 7-14 days (organization, planning the number of participants)
Statistics and optimization
In the admin area, operators can analyze:
- How many customers try to book at shorter notice than the lead time allows? (shows unused demand)
- How far in advance do customers typically book? (helps find the optimal lead time)
- Are short-notice slots (short notice) actually booked?
This data helps to continuously optimize the lead time.