While the SWF is optimum it is not a must. If you had read the book you would have seen that the recomendation is either lax tea at night and SWF in the morning or tea at night and mornings.
Liquid in liquid out that's the bottom line. It takes the system approxmimately 3 days to empty the bowels. After that it's perfectly normal to have nothing but "butt pee". If you pass solids past like the 5th day that is an indication that you are a good candidate for some dedicated colon cleansing.
While the MC does "aid" in cleansing the colon it is not a colon cleanse. Do a little research about dedicated colon cleansing. After the MC things have been softened quite a bit and it would be a good time to do one.