Everyone is different and I really can't answer your question as to how long!
I, personally, have never worried about getting rid of mucoid plaque. I go on a Colon Cleanse for my health and to make me feel better. Also I believe that going on short Colon Cleanse (say 3 to 7 days) and repeating this type of cleanse several times a year works better.
A lot depends on what you are trying to accomplish and on what your body tells you. One of my "beefs" is that people follow what they read without considering what their bodies are telling them and then problems!