Most radiation sessions last between 5 and 15 minutes, give or take. Mine was to my brain and lasted all of 5 minutes with 6 different beams in 6 different areas.Yeah Spree, My first treatment, I was strapped to the table by my mask for almost an hour. Talk about state of panic! I just had to keep my mind thinking of different things to pass the time. Also once a week, they'd do xrays before treatments and that'd add an extra few minutes on to my "strap down" time. "april" is my real name!Actually you only have an "apparatus" if it's treatment for a brain tumor. And I'd walk into the clinic and walk out 10 minutes later!