Appointment delays stack up because healthcare operates on unpredictable timelines. A routine 15-minute slot can balloon to 40 minutes when a patient presents multiple concerns, needs test result explanations, or reveals symptoms requiring immediate attention. Unlike retail or service businesses, doctors can't cut conversations short without risking missed diagnoses or liability. Clinics typically overbook by 10–20% to compensate for no-shows and cancellations, which means any appointment running over creates a domino effect. By mid-afternoon, a doctor who started on time can be 45–90 minutes behind if just two or three patients needed extra care. Emergency cases and hospital rounds further fragment schedules, especially for specialists who split time between clinic and surgical suites. Documentation requirements add hidden time. Canadian physicians must complete EMR entries, referral letters, prescription authorizations, and billing codes for each patient—work that happens between appointments but eats into the buffer time meant to keep schedules on track. Provincial billing rules often incentivize volume over length, so doctors pack schedules tight to maintain revenue. The math breaks down like this: a family doctor seeing 25–35 patients daily with 15-minute slots needs every appointment to finish in 12 minutes to stay on schedule when accounting for charting. That's unrealistic when 30–40% of visits involve multi-issue discussions, prior authorization calls, or coordinating specialist referrals. From an operations perspective, wait times also reflect poor schedule design. Clinics that don't block buffer slots, don't stagger appointment types by complexity, or don't have support staff handling prescription renewals and paperwork will always run late. Some practices have cut average delays by 20–30 minutes just by assigning nurses to handle routine follow-ups and using online intake forms to frontload information gathering. Patients calling around 8–9 AM for same-day appointments typically face the longest waits because slots fill instantly. Booking the first appointment of the day or right after lunch minimizes delay risk since the cascade hasn't started yet.