The More Often You Fast The Longer You Will Be Able to Fast

I do not want to limit your fasting to 10 days. But I
do not advise fasting any longer than 10 days until you
have had, at the very least, four 10 day fasts spaced at 4
month intervals. With that experience behind you, now
you could graduate to a 15 day fast. By then you have
done a tremendous amount of internal house cleaning.