I have a CT Colonscopy tomorrow and took the advised prep at 8am (picolax laxative) . I opened bowels just as normal at 10am. Took the second sachet at 2.45pm. I haven't opened my bowels yet. Should I be worried or can it take this long. I took this 7 years ago and it took a while but not this long. It was very explosive and certainly cleared me out last time.