Never in all the time I've been seeing her--about 3 years, maybe longer. I've called & rescheduled & once cancelled the day of the appt. due to snow. See her tomorrow. She hasn't ever taken a vacation that interferes with my seeing her. I used to see her once a week, now every 2 weeks except when I'm traveling. One other thing that maybe makes a difference is she only works 3 days a week, but has always gotten me in if I'm in a crisis. I guess so far I've only had a crisis on the days she works!--Suzy