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Colon prep takes 1 to 2 days, depending on which type of prep your doctor recommends. Some preps may be taken the evening before the test. For many people, the prep is worse than the test. The bowel prep may be uncomfortable, and you may feel hungry on the clear liquid diet.
2 Jun 2011. Ok. Your colonoscopy is at 8am. You need the prep and water followed 10-12 hours later by another dose of prep and water. I would say to start the first prep at 8am the day before and 10-12 hours later would be 6-8pm to do the next dose of prep and water. Sleep as much as you can the night before.