As someone who has been involved with machine control engineering my working life I'd agree with Hermit - the machine itself is fascinating if you're that way inclined..
I found myself counting seconds as the machine rotated for the actual treatment phase - one elephant, two elephants, three elephants etc. and the traversing actually took 60 elephants first in one direction and then another 60 in the reverse rotation.
On a few occasions the machine rotated the opposite way to the rest of the time. I couldn't find anyone to explain why that was.
The arms have four different bits of kit, performing different functions, on them evenly spaced - so each passes overhead at 15 elephant intervals.
Anyway a total of two minutes of treatment and most days in and out of the room in just under 10 minutes. (Appointment times on the machine were at ten minute intervals and so you'd pretty much be in within 30 seconds of the guy before you coming out).
Like all the stages of this treatment process the actual RT experience is much less daunting in reality than your imagination has built it up to be beforehand (or at least that's how I've found things).