I'm pretty sure the human body functions pretty much the same way it did 30 years ago. These things aren't likely to have changed much:
"The residence time in the small intestine may generally vary from 2 to 4 h prior to arrival in the colon. Transit through the colon is highly significant in terms of controlled release products and drug absorption. It varies from a few hours to 2 days, depending on parameters such as the nature of the ingested nutrient (high or low content of dietary fibers), age, and disease state."
Way to duck the question. Try again: Results are due SOON. What outcomes would you describe as successful enough to justify pounding the table?