How many days of menstruation is ovulation?

Although everyone's menstrual cycle is different, generally speaking, a woman's eggs begin to be released on the 14th day of the menstrual cycle and reach their highest content on the 20th day. Over the next few days, the egg continues to divide and mature until it is expelled from the ovary on day 28.

Therefore, we can calculate a woman's ovulation period by subtracting 14 days from her menstrual cycle. For example, if a woman has a 28-day menstrual cycle, her ovulation period will begin on day 14 and end on day 20.

However, please note that this is just a simple calculation method and cannot be completely accurate in predicting a woman's ovulation period. Because women's menstrual cycle will be affected by many factors, such as climate, mood, diet, etc.