Or most likely of all for a wait of that magnitude: their employer forces them to cram more patients than they should into a short time, and it turns out not every medical issue falls into nice little predictable fifteen minute block, and someone or multiple people earlier than you had major issues to be sorted.

Also common: patients earlier than you showing up late but their employer forces them to see patients even if they got there with only a minute of their appointment left and now it throws off everyone’s appointments for the entire rest of the day

Also who’s actually charging late fees? Most places the policy is to fire you from the clinic for ~3 no shows

People here acting like a doctor is just sitting in the back twiddling their thumbs laughing while you wait. They just want to see everyone and get home, they don’t want to be seeing people late either, but stuff happens.