That depends!  For during the week appointments, we recommend calling at least 1-2 weeks in advance to book your visit.  Please note however, that if you are planning on a Saturday visit, it is best to book that at least 3-4 weeks in advance as that is our most desired day.  Also, we do often have a cancellation list for Saturday appointments.  This is an option if we are booked for the day and time you are hoping for.