needsadvice,
All depends on what treatment is designed for you. If your team wants to do prior implanted Space/Oar you will not have to have a balloon inserted prior to treatments which causes more time before treatment starts.

If you team wants prior implanted markers then those are used each time to align proton beam therapy. I read one post about MRI Proton where markers were not used but real time MRI monitoring and if prostrate moves machine shuts down. This would cause a delay in treatment also.

I even read one post with an enema before treatments. I never had to do that. I did prior to some of the tests done but not during treatments.

Your team may recommend high dose which is 5 treatments or low dose which can be 20-40 treatments (mine was 30). I did 5 treatments a week for 6 weeks. I am told the high dose is 3 days one week and 2 days the next. Probably time of treatments is around 10 minutes but that depends on each individual and their treatment plan.

How much time? All depends on the preps. My procedure was very fast. Laid on a special bed that was made specifically for me to keep me in same position each time. Then a low dose xray to look at markers and adjust table as needed. Then the treatments which last around 10 minutes. The total time I was on table was around 15 minutes. There was one time I was told I had gas and had moved prostrate (it will move around) and had to adjust table.

I drank water before hand to move away bladder. I hope this information helps. All that would be explained by your oncologist/radiologist and if not go somewhere else for treatments.