http://stopcoloncancernow.com/colonoscopy/what-to-expect#vm_A_ecce975c
Colonoscopies are visual examinations of the large intestine using small camera attached to a thin, light, and flexible tube. Patients are sedated during the procedure to relax their muscles and reduce any discomfort. Most patients are asleep for the actual procedure.
Colonoscopies usually take from anywhere to 30 minutes to an hour.
If polyps (growth of tissue) is found during the procedure, they are simply removed.
It’ll take an hour to begin to recover from the sedatives and you’ll need someone to drive you home. Your physician will generally go over your results with you with 24-72 hours.