There is no delay, as Vetstoria is synchronised with your software in real-time. Appointments made via Vetstoria will appear immediately in your PMS, and emergency block-offs, or appointments booked directly into your PMS, will be immediately reflected in Vetstoria. So if a veterinarian is off sick, or you need to block your calendar for an emergency, you can simply update your PMS and Vetstoria will update itself accordingly.