hello in the unit i work in in southern california we can discharge pts after being in recovery for 1/2 and their vital signs are within a normal range of their baseline. we also require pts to pass the air from the colonoscopy and have a soft non tender abdomen and to be able to swallow without and pain or difficulty after an egd. we use demerol and versed. usually the average does is 50mg demerol 3-4 mg of versed per pt. that is the average. sometimes less and sometimes more. we are also seeing a trend of pts (especially men) having a colonoscopy without and sedation. they leave after they pass the residual air from the procedure. a 24hr stay is excessive and versed is pretty much metabolized in about 20 mins. good luck! lisa