The first time I did the cleanse, I took the laxative at night and in the morning. For me this was too much and I experienced cramps. But taking the laxative at night and SWF (Salt-Water-Flush) in the morning works well for me.
I would suggest using the laxative for at least 5 days, or go up to 10. If you are going longer on the cleanse, then try without the laxative, but make sure you are still eliminating.