30-8pm prior to not drinking fluids
for 3-4 hrs. if you hav 30 day cycle, u can start from CD 12-20. also
for CM- i tried it on one month just to see if its work or not, its drinking ruby red grapfruit juice. regular grapfruit juice will work too, but ruby is sweeter. however, drinlk every 2-4 hrs then u will see very good amount of CM on the same day.