I'm not a stickler for time. I live my life by the bells all day (I'm a teacher), so I try not to be too obsessive about it elsewhere in my life. Five minutes late doesn't bother me in the least. So long as I was getting the amount of time I am paying for, personally, I wouldn't worry about it. I certainly wouldn't leave a therapist if this was the only issue. My therapist starts his sessions about 10 minutes after the hour and they go to the hour. He's pretty consistent about that. So I know if I have a 5PM appointment, we'll get started abut 5:10. Works for me. I'm still getting my 50 minutes.