I had the small bowel follow through and upper GI last Dec, they were checking for possible kinks in the bowel, or crohns, I was there for 4 hours, but the test results were negative, they told me that the barium took some tim to get through, and the pictures were taken every 15 minutes, and then a floroscope or something, a big light was exraying me. They never told me anything about how long it takes to get to the small bowel.
Toni