How long would you wait...

....in a doctors office before getting up and leaving? Not a doc that has emergency visits...
Ernie had a 3:15 appointment with her Rheumatologist. She has not been feeling well for the past month or so...At 3:55 she grabbed me by the hand and said we are leaving. She sees 2 different docs in this place on an alternating schedule, everytime she sees this particular doc we are in the waiting room for at least 30 minutes after her scheduled time...then at least another 15 minutes in the exam room...