How long does enema last, told to take it 1hr b4 leaving home for sig. Worried I'm going to soil my pants on the drive down!

Empty completely! Your risk of soilage after a single enema depends on: type and volume of enema used, GI transit and irritability, baseline stool pattern (diarrhea?), whether anal/rectal function is intact, how completely you emptied after using the enema, how far/long you have to drive. No shame in wearing a pad for the trip--.