For instance, let's consider Karl who has booked a tour at Listing A for Friday at 11:00 am.
Now let's assume your preferences are: cluster tours and max 3 visitors one time.
When Susan looks at the available times on Friday for Listing A, this is what she will see:
She will only see 10:30 am, 11:00 am, and 11:30 am as times she can book. This ensures you are, as the setting says, clustering your tours together efficiently.