Many women ask their doctors how many days is a delayed period considered normal? The normal menstrual cycle is about 28 days, and ovulation occurs two weeks after the start of the period and two weeks before the next period. Most women menstruate once every 28-30 days, but it is still normal to have a period that is 7 days early or late. The duration of a period is usually 3-7 days and the amount of bleeding from a period is about 30-50 ml. How many days is it normal to delay menstruation? Regarding how many days are considered normal for menstruation to be delayed, it is said that except for ovulation, the rest of the menstrual cycle is called a safe period for women. However, because ovulation is affected by many factors and can be advanced or postponed by a few days, the safety period is divided into absolute and relative; absolute safety period refers to the days that are absolutely safe even if there is a change in the ovulation date. Because the ovulation date usually does not change more than 3 days before and after, the week before and after menstruation (assumed to be 3 days) should be absolutely safe, and the closer the day to menstruation, the safer it is. A normal woman of childbearing age has a menstrual cycle once a month, from the beginning of the current menstrual period to the first day of the next menstrual period, which is called one menstrual cycle. For contraceptive reasons, each menstrual cycle of a woman can be divided into menstrual period, ovulation period and safety period. A woman’s ovulation date is usually about 14 days before the next menstrual period. The egg can survive 1-2 days in the fallopian tube after being discharged from the ovary to wait for fertilization; the man’s sperm can maintain the fertilization ability in the woman’s reproductive tract for 2-3 days, so it is easy to conceive during intercourse in the days before and after the egg is discharged. For insurance purposes, we refer to the 5 days before and 4 days after the day of ovulation, together with the day of ovulation, as the 10 days of ovulation. Because it is easy to conceive during ovulation, the ovulation period is also called the fertile period or the risk period. There is a time period for delayed menstruation, beyond which it is considered a delayed period and is a symptom of irregular menstruation. There is a medical rule that a delayed period is usually about one week. A normal menstrual flow is an important sign of a mature woman’s health. If the delayed menstruation persistently occurs, it should be taken seriously and a doctor can be consulted or examined to ensure health.