Minimum notice sets how soon someone can book a Google Calendar appointment before it starts. Use it to preserve preparation time rather than relying on a sentence asking visitors not to book at short notice. It is separate from the latest date people may book.
Open the scheduling window
On a computer, create or edit the intended Appointment schedule. Find Scheduling window and review the minimum advance booking setting. Google’s current availability guidance describes a default minimum lead time of four hours.
Set the required preparation interval
Choose the notice period that fits the actual appointment. Consider preparation, travel, and the hours in which booking messages are monitored. Check the schedule’s time zone and weekly availability instead of treating the notice period as the only limit on offered times.
Keep this separate from buffer time between appointments. A buffer protects the interval around meetings; minimum notice prevents a visitor from booking an appointment too close to its start.
Verify the approaching dates
Save and inspect the visitor page near the earliest allowed time. Check that appointments inside the restricted interval are not offered and that a later legitimate slot remains available when other rules permit it. Do not remove conflict checking merely to make a test slot appear. Existing booked appointments need their own review; changing a future booking rule is not a cancellation notice. Keep the description consistent with the actual configured notice period. A correct minimum setting supports preparation, but it does not guarantee you will see every confirmation immediately or replace an appropriate process for monitoring and responding to new bookings.
References
Reviewed against the linked official product guidance on November 4, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.