Was asked to monitor my stool. this am ate 2 small orange slices & 1 hour later had a bm & noticed the casing of 2 oranges. why was processed so fast?

Doubtful: It is doubtful that remnants of the Orange would appear in your stool after only one hour as that would be extremely rapid transit through many feet of upper and lower intestines. Is it possible that you observed mucus in your stool as can be seen with irritable bowel syndrome? A gastroenterologist is best qualified to evaluate and advise you as well as arrange stool analysis.