Ovarian cyst is milky watery discharge normal when it ruptures? How long does the discharge last?

May not be related. When an ovarian cyst ruptures, the fluid that comes out of the cyst is generally straw-colored or clear fluid. That fluid is inside your belly & doesn't come out of your vagina as a discharge. If you are having discharge, that may be an entirely separate issue. If you are having discharge that has a bad odor; is causing itching, burning or irritation, i suggest you have your gyn take a look at it.