In the Arise and Shine Kit it says to take your herbal tablets one and a half hours after the shake, so maybe this is a good guide as a minimum amount of time? Bentonite is a great sucker uppera!
Have you read any of MH's posts on parasite killing? He is not a big fan of psyllium from what I understand, I'm not sure what he recommends for bowel cleansing, but for parasites he says oragano oil, olive leaf extract, and a de-worming mixture plus pumkin seeds I think.