One thing I will say: Do NOT make that mistake during treatment because you will pay for it down the road.
If you’re lucky you’ll get kicked off the table before any harm is done but it all depends on your team and how vigilant and disciplined they are.
YOU have the important job of bladder and bowel prep. If you are lax the radiation will cause all kinds of issues and make your life miserable.
Just follow the rules exactly to the letter and SBRT will be smooth and uneventful.
Phil