I had this test done in September, and it was the easiest for me. The whole process does take awhile, because you have to drink the barium, and then it needs time to get to your small intestine. (I was mostly left alone during this time, so you could take a book or something to occupy you while you wait.) But the actual "test" itself - when they are getting the images, took very little time...maybe 10 minutes? After that, I was sent on my way. I felt a little -- unsettled -- for a day or so, while everything worked it's way out of my system, but otherwise, it was simple (for me).