What you described is what will happen. Takes 1 1/2 -2 hours. They inject a dye that highlights the GB (takes about an hour)then they inject something called CCK to make your GB contract(takes 30 mins. to 1 hour). I had mine done at our hospital. I don't know if your husband will be allowed in though. You could ask. Mine was done in a room with a bunch of x-ray machines and stuff. I would suggest bringing a book or something to pass the time as it is long and boring--no one warned me of this!