Just one day. Because I had been taking the super colon capsuals and to tell you the truth I was having bowel movements but they were not complete (like you said) and I had moved recently and had noticed the regular colon cleanse(the psyllium husks) just sitting under my end table, and I had about 2/3 of it left. So I remembered I had used it a long time ago when I did a monthly cleanse.I had used another brand that contained psyllium husks, any way I went online and started looking up colon cleanses and they were comparing some according to price and ingredients. And I looked up the ingredient psyllium and on the bottle of my other colon cleanse( I just brought, the Super colon cleanse powder) I saw that it said if you want better results use with the regular colon cleanse along with it, and that's what I did, after reading about the psyllium, and the results were noticeable the same night,in fact I was at work. After the bowel movement I felt lighter and the swelling even went down in my stomach. I even felt much different in my upper intestines too, but I had remembered Dr. Oz saying our stools should resemble an S-shape, like our colons otherwise you aren't really getting a healthy one and I can tell you out of my 45 years I can say this is the first time I remember actually feeling good and light after having a good colon cleanse. But because I have TMAU symtoms I try to do a colon cleanse maybe twice a week, but yes the results were right away. And I had read online that any laxatives or colon cleanses that contain sugar are not really good because they seem to defeat the purpose of a good colon cleanse, but the psyllium is the ingredient along with the others that really cleans the colon out. And the hot gas you should be careful because the psyllium husks makes your BM's softer be careful because you don't want too stain your undies. It's possible the psyllium could be working on the crap in your tummy. Google your question on line I'm sure it's nothing really strange. But if you use the psyllium husk colon cleanse and the super colon cleanse and you keep having gas go to the Bathroom because after taking it you may want to be at home or after several hours be near the bathroom okay?