How many days until "normal" stool after being cleaned out for a colonoscopy?

Variable per person: Your question is excellent, but the response is individualized based on a patient's initial adequacy of preparation, GI transit time, rapidity in returning to "normal" diet, use of probiotics, co-morbidities that may require use of antibiotics or medications that affect gut flora, as well as the underlying pathology found in the gut. Typically your "back to normal" in 3-4 days.

Varies: Can be as soon as the following day once a normal diet is resumed, but not unusual to have a "normal" stool in 2-3 days after your bowel prep.