that sounds pretty sensible...

for some, it might be less:like twenty-one days for each year, 21 days being one cycle the body seems to often adhere to. Some say it takes 21 days to change a habit--
and that applies to a 'habit' the body may have for dis-ease (or less serious problems)as well. 21 days = three times 7 days: another common period of time for changes to take place.

it's all about cycles. Cycles and pH.