How to know what is best way to cure constipation and how long does it take?

Fiber, water, fiber. The vast majority of constipation comes form inadequate fiber intake. In 3rd world countries with high fiber intakes, constipation related diseases like hemorrhoids, prolapse, diverticulosis and even colon cancers are at a much lower rate than in "big mac" cultures like ours. Fiber should be started slowly and advanced to a diff level for everyone, water has to come with it or you will mix cement.