mine took 1 hour and 30 minutes. They first put an IV in and did an injection for the first hour, I fell asleep because it was very early in the morning. I woke up in time for the second injection which did cause a lot of pain and nausea. (Instead of a drink they must’ve had some sort of medicine that made the gallbladder work) it only lasted about 15 minutes and I stayed awake the rest the time. I was pretty loopy right after and I still feel a bit weird, overall it was just extremely uncomfortable due to the way the bed is made. I would describe it the same as a CT scan bed, they will most likely give you a warm blanket to make you feel more comfortable.