My RT clinic chronically late with appointments—your experience?

I worked in a commercial lab for part of my career, so I understand how technical difficulties can cause delays. I expect some of that with any instrument or machine. And I understand that some radiation treatments are more difficult than others and that can cause delays. But my RT clinic is chronically behind schedule, anywhere from 10-40 minutes. The RT folks running the machine are good, technically competent people, and I empathize with them when them are running behind (I can tell it stresses them out), but man this is a real stressor for me too when I am trying to hold my bladder and keep my bowels from acting up, not knowing how soon I will be called.

My appointment time has been at 11:30 am, but today I switched to 10:30 am because they had a “difficult case” starting today and it helped them out if I came an hour earlier. I thought that maybe coming earlier in the day would reduce the probability of them running late. Well 10:30 came, and I had a very full bladder, with three guys waiting in front of me. Bad sign. At 10:35, a tech came in and said they were running at least 30 minutes late. I told her I couldn’t wait that long and was going to pee and go home, which I did. She apologized, and told me they were going to skip their lunch break today to try to catch up. Again, I felt bad for her, but also my working experience in a lab also taught me that when instrument techs are under pressure to get work done, mistakes are much more likely to occur. I do not want to be the recipient of any such mistake during my therapy.

My sense of the situation is that the facility books too many back-to-back appointments. When something goes off the rails, there is no wiggle room in the schedule for catching up. I have set a limit of waiting 30 minutes beyond my appointment time before calling it off—if I can last that long. This really distressed me today because skipping days (even though they are added to the backend of my treatment plan) can compromise the effectiveness of the RT, according to my RO.

What is/was your experience with this issue? Is this a common problem, or something specific to my clinic?